Learning stylesheet to go along with http://themeshaper.com/2012/11/12/how-to-reset-rebuild-wordpress-theme-css-define-your-layouts/

gistfile1.css

/*
Theme Name: Your Theme Name
Theme URI: Your Theme URL
Author: Your Name
Author URI: Your URL
Description: Describe your theme and its features.
Version: Your Theme's Version Number
License: GNU General Public License
License URI: license.txt
Tags: insert tags to describe your theme to help users search for it. Find the list of tags at: http://wordpress.org/extend/themes/about/

This theme, like WordPress, is licensed under the GPL.
Use it to make something cool, have fun, and share what you've learned with others.

IMPORTANT: This stylesheet is designed for learning and includes comments for guidance. It's a good idea to remove the comments when preparing your them for distribution. However, keep the section headers (the word "Reset" below is an example of a section header) intact.

Resetting and rebuilding styles have been helped along thanks to the fine work of Eric Meyer http://meyerweb.com/eric/tools/css/reset/index.html
along with Nicolas Gallagher and Jonathan Neal http://necolas.github.com/normalize.css/ and Blueprint http://www.blueprintcss.org/
*/


/* =Reset
-------------------------------------------------------------- */

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, font, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td {
  border: 0;
	font-family: inherit;
	font-size: 100%;
	font-style: inherit;
	font-weight: inherit;
	margin: 0;
	outline: 0;
	padding: 0;
	vertical-align: baseline;
}
html {
	font-size: 62.5%; /* Corrects text resizing oddly in IE6/7 when body font-size is set using em units http://clagnut.com/blog/348/#c790 */
	overflow-y: scroll; /* Keeps page centred in all browsers regardless of content height */
	-webkit-text-size-adjust: 100%; /* Prevents iOS text size adjust after orientation change, without disabling user zoom */
	-ms-text-size-adjust: 100%; /* www.456bereastreet.com/archive/201012/controlling_text_size_in_safari_for_ios_without_disabling_user_zoom/ */
}
body {
	background: #fff;
}
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
nav,
section {
	display: block;
}
ol, ul {
	list-style: none;
}
table { /* tables still need 'cellspacing="0"' in the markup */
	border-collapse: separate;
	border-spacing: 0;
}
caption, th, td {
	font-weight: normal;
	text-align: left;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: "";
}
blockquote, q {
	quotes: "" "";
}
a:focus {
	outline: thin dotted;
}
a:hover,
a:active { /* Improves readability when focused and also mouse hovered in all browsers people.opera.com/patrickl/experiments/keyboard/test */
	outline: 0;
}
a img {
	border: 0;
}


/* =Global
----------------------------------------------- */

/* Set a default font size, color, line-height, and font family for your body element and all input elements. These can get overridden later on in the stylesheet, but are useful as base styles. */

body,
button,
input,
select,
textarea {
	
}

/* Headings */
h1,h2,h3,h4,h5,h6 {
	clear: both;
}
h1 {
	
}
h2 {
	
}
h3 {
	
}
h4 {
	
}
h5 {
	
}
h6 {
	
}

/* Text elements */
p {
	margin-bottom: 1.5em;
}
ul, ol {
	margin: 0 0 1.5em 3em;
}
ul {
	list-style: disc;
}
ol {
	list-style: decimal;
}
ul ul, ol ol, ul ol, ol ul {
	margin-bottom: 0;
	margin-left: 1.5em;
}
dt {
	font-weight: bold;
}
dd {
	margin: 0 1.5em 1.5em;
}
b, strong {
	font-weight: bold;
}
dfn, cite, em, i {
	font-style: italic;
}
blockquote {
	font-style: italic;
	margin: 0 1.5em;
}
address {
	margin: 0 0 1.5em;
}
pre {
	font-family: "Courier 10 Pitch", Courier, monospace;
	font-size: 15px;
	font-size: 1.5rem;
	line-height: 1.6;
	margin-bottom: 1.6em;
	padding: 1.6em;
	overflow: auto;
	max-width: 100%;
}
code, kbd, tt, var {
	font: 15px Monaco, Consolas, "Andale Mono", "DejaVu Sans Mono", monospace;
}
abbr, acronym {
	border-bottom: 1px dotted #666;
	cursor: help;
}
mark, ins {
	background: #fff9c0;
	text-decoration: none;
}
sup,
sub {
	font-size: 75%;
	height: 0;
	line-height: 0;
	position: relative;
	vertical-align: baseline;
}
sup {
	bottom: 1ex;
}
sub {
	top: .5ex;
}
small {
	font-size: 75%;
}
big {
	font-size: 125%;
}
figure {
	margin: 0;
}
table {
	margin: 0 0 1.5em;
	width: 100%;
}
th {
	font-weight: bold;
}
hr {
}

/* Form Elements */
button,
input,
select,
textarea {
	font-size: 100%; /* Corrects font size not being inherited in all browsers */
	margin: 0; /* Addresses margins set differently in IE6/7, F3/4, S5, Chrome */
	vertical-align: baseline; /* Improves appearance and consistency in all browsers */
	*vertical-align: middle; /* Improves appearance and consistency in all browsers */
}
button,
input {
	line-height: normal; /* Addresses FF3/4 setting line-height using !important in the UA stylesheet */
	*overflow: visible;  /* Corrects inner spacing displayed oddly in IE6/7 */
}

/* Gives a basic visual design to form elements */
button,
html input[type="button"],
input[type="reset"],
input[type="submit"] {
	border: 1px solid #ccc;
	border-color: #ccc #ccc #bbb #ccc;
	border-radius: 3px;
	background: #e6e6e6;
	-webkit-box-shadow: inset 0 1px 0 rgba(255,255,255,0.5), inset 0 15px 17px rgba(255,255,255,0.5), inset 0 -5px 12px rgba(0,0,0,0.05);
	-moz-box-shadow: inset 0 1px 0 rgba(255,255,255,0.5), inset 0 15px 17px rgba(255,255,255,0.5), inset 0 -5px 12px rgba(0,0,0,0.05);
	box-shadow: inset 0 1px 0 rgba(255,255,255,0.5), inset 0 15px 17px rgba(255,255,255,0.5), inset 0 -5px 12px rgba(0,0,0,0.05);
	color: rgba(0,0,0,.8);
	cursor: pointer; /* Improves usability and consistency of cursor style between image-type 'input' and others */
	-webkit-appearance: button; /* Corrects inability to style clickable 'input' types in iOS */
	font-size: 12px;
	font-size: 1.4rem;
	line-height: 1;
	padding: 1.12em 1.5em 1em;
	text-shadow: 0 1px 0 rgba(255,255,255,.8);
}
button:hover,
html input[type="button"]:hover,
input[type="reset"]:hover,
input[type="submit"]:hover {
	border-color: #ccc #bbb #aaa #bbb;
	-webkit-box-shadow: inset 0 1px 0 rgba(255,255,255,0.8), inset 0 15px 17px rgba(255,255,255,0.8), inset 0 -5px 12px rgba(0,0,0,0.02);
	-moz-box-shadow: inset 0 1px 0 rgba(255,255,255,0.8), inset 0 15px 17px rgba(255,255,255,0.8), inset 0 -5px 12px rgba(0,0,0,0.02);
	box-shadow: inset 0 1px 0 rgba(255,255,255,0.8), inset 0 15px 17px rgba(255,255,255,0.8), inset 0 -5px 12px rgba(0,0,0,0.02);
}
button:focus,
html input[type="button"]:focus,
input[type="reset"]:focus,
input[type="submit"]:focus,
button:active,
html input[type="button"]:active,
input[type="reset"]:active,
input[type="submit"]:active {
	border-color: #aaa #bbb #bbb #bbb;
	-webkit-box-shadow: inset 0 -1px 0 rgba(255,255,255,0.5), inset 0 2px 5px rgba(0,0,0,0.15);
	-moz-box-shadow: inset 0 -1px 0 rgba(255,255,255,0.5), inset 0 2px 5px rgba(0,0,0,0.15);
	box-shadow: inset 0 -1px 0 rgba(255,255,255,0.5), inset 0 2px 5px rgba(0,0,0,0.15);
}
input[type="checkbox"],
input[type="radio"] {
	box-sizing: border-box; /* Addresses box sizing set to content-box in IE8/9 */
	padding: 0; /* Addresses excess padding in IE8/9 */
}
input[type="search"] {
	-webkit-appearance: textfield; /* Addresses appearance set to searchfield in S5, Chrome */
	-moz-box-sizing: content-box;
	-webkit-box-sizing: content-box; /* Addresses box sizing set to border-box in S5, Chrome (include -moz to future-proof) */
	box-sizing: content-box;
}
input[type="search"]::-webkit-search-decoration { /* Corrects inner padding displayed oddly in S5, Chrome on OSX */
	-webkit-appearance: none;
}
button::-moz-focus-inner,
input::-moz-focus-inner { /* Corrects inner padding and border displayed oddly in FF3/4 www.sitepen.com/blog/2008/05/14/the-devils-in-the-details-fixing-dojos-toolbar-buttons/ */
	border: 0;
	padding: 0;
}
input[type=text],
input[type=email],
textarea {
	background: rgba( 255, 255, 255, 0.3 );
	border: 1px solid #ccc;
	border-radius: 3px;
	padding: 6px;
}
input[type=text]:focus,
input[type=email]:focus,
textarea:focus {
	background: #fff;
}
textarea {
	overflow: auto; /* Removes default vertical scrollbar in IE6/7/8/9 */
	padding-left: 3px;
	vertical-align: top; /* Improves readability and alignment in all browsers */
	width: 98%;
}

/* Links */
a,
a:visited {
	
}

a:hover,
a:focus,
a:active {
	
}

/* Alignment - WordPress uses these classes to align images and other elements inside the editor. */
.alignleft {
	display: inline;
	float: left;
	margin-right: 1.5em;
	margin-bottom: 1em;
}
.alignright {
	display: inline;
	float: right;
	margin-left: 1.5em;
	margin-bottom: 1em;
}
.aligncenter {
	clear: both;
	display: block;
	margin: 1.5em auto;
}

/* Text meant only for screen readers. It's hidden due to the clip property, but visible in the page source. If you take a look back in the template files at the mark-up for our main menu and other navigation areas, you'll notice that we have headers such as "Menu" and "Site Navigation" wrapped in an <code>h1</code> tag with a class of "assistive-text". Screen readers will read this text aloud, making it easier for users to locate structural sections in your theme.
*/
.assistive-text {
	clip: rect(1px 1px 1px 1px); /* IE6, IE7 */
	clip: rect(1px, 1px, 1px, 1px);
	position: absolute !important;
}

/* If you want to give a common style to all of the titles in your theme, here's a place to do it (you can style them individually later) */
.site-title,
.entry-title,
.page-title,
.widget-title,
.comments-title,
#reply-title {
	
}


/* =Structure
----------------------------------------------- */

/* Refer to the HTML structure graphic (http://themeshaper.com/wp-content/uploads/2012/10/html-visual.png) to see how these elements are nested in the mark-up. 

Use this section to set widths and margins, and to build a layout. For examples of layouts that you can copy and paste into this section, see:
https://github.com/Automattic/_s/blob/master/layouts/
*/

.site { /* The the outer-most container, wraps the entire site */
		
}
.site-header { /* The container for the entire header area */
	
}
#main { /* The container for #primary, #secondary, and #tertiary */
	
}
#primary { /* The container for your primary content.*/

}
#content { /* The container for your post and page content. */

}
#secondary { /* Container for your first widget area */

}
#tertiary { /* Container for your second widget area */

}
.site-footer { /* Container for the entire site footer area */

}


/* =Site Header
----------------------------------------------- */

/* Style elements inside of the .site-header container */

.site-header hgroup { /* Container for site title and description */

}
.site-title,
.site-title a {

}
.site-description { /* This is the tagline */
	
}


/* =Menu
----------------------------------------------- */

/* Style your navigation menu, which is inside .site-header. A basic drop-down menu structure is provided. */

.main-navigation { /* wraps the entire navigation menu */
	
}
.main-navigation:after { /* Clears the floats after the menu */
	clear: both;
	content: "";
	display: block;
}
.main-navigation ul { /* The menu is an unordered list */
	list-style: none;
	margin: 0;
	padding-left: 0;
}
.main-navigation li { /* Makes the menu "list" items horizontal */
	float: left;
	margin: 0.5em 0;
	position: relative;
}
.main-navigation a { /* The individual list item links */
    display: block;
    text-decoration: none;
}
.main-navigation ul ul { /* Submenu drop-down "box" */
	display: none;
	float: left;
	position: absolute;
		top: 1.2em;
		left: 0;
	z-index: 99999;
}
.main-navigation ul ul ul { /* 3rd+ level drop-down "box" */
	left: 100%;
	top: 0;
}
.main-navigation ul ul li { /* List items inside the drop-down box */
}
.main-navigation ul ul a { /* Menu links inside the drop-down "box" */
	padding: 0 1.5em;
	width: 200px;
}
.main-navigation li:hover > a,
.main-navigation li.current_page_item a,
.main-navigation li.current-menu-item a,
.main-navigation ul ul a:hover { /* Hover styles for menu items */

}
.main-navigation ul ul :hover > a {
	
}
.main-navigation ul li:hover > ul {
	display: block;
}

/* Small menu toggle area for screens < 600 pixels wide. The small menu requires some simple JavaScript in order to take affect. See http://themeshaper.com/2012/10/31/the-wordpress-theme-header-template/ for instructions on setting up this script. */
.menu-toggle {
   	cursor: pointer;
}
.main-small-navigation .menu {
	display: none;
}


/* =Content
----------------------------------------------- */

/* Styles for posts and pages */
.sticky { /* Style your sticky posts. This class is applied to the same element as .hentry below. */
	
}
.hentry { /* The wrapper for individual posts */
	margin: 0 0 1.5em;
	padding-bottom: 1.5em;
}
.entry-header { /* Container for the entry title, byline and post date */
	
}
.entry-title, 
.entry-title a { /* Post titles */

}
.page-title { /* Page titles */

}
body.search .page-title,
body.archive .page-title { /* Optional, if you want your page titles to look different on search and archive pages */

}
.entry-meta { /* Container for the entry metadata */
	clear: both;
}
.entry-date { 
	
}
.byline { /* By default, bylines are hidden */
	display: none;
}
.single .byline,
.group-blog .byline { /* Bylines are displayed on single posts and/or when there are multiple authors */
	display: inline;
}
.cat-links {  /* Styles category links inside the entry meta */
	
}
.tag-links { /* Styles links to tags inside the entry-meta */
	
}
.sep {  /* Separator between category links, cat links, comments links, etc */
	
}
.comments-link {  /* Link to leave a comment */
	
}
.edit-link { /* Link to Edit the post (only shows up for admins)
	
}
.entry-content,
.entry-summary { /* Container for the post body/excerpt text */
	margin: 1.5em 0 0;
}

/* Styling In-Post Tables */
.entry-content table,
.comment-content table {
	border: 1px solid #000;
	border-left-width: 0;
	margin: 0 -0.083em 2.083em 0;
	text-align: left;
	width: 100%;
}
.entry-content tr th,
.entry-content thead th,
.comment-content tr th,
.comment-content thead th {
	border-left: 1px solid #000;
	font-weight: bold;
	padding: 0.5em 	1.25em;
}
.entry-content tr td,
.comment-content tr td {
	border: 1px solid #000;
  	border-width: 1px 0 0 1px;
	padding: 0.5em 	1.25em;
}
.entry-content tr.odd td,
.comment-content tr.odd td { /* If you want to apply alternate styles to even/odd table rows */

}

.page-links { /* Style the page numbers for multi-page posts (posts that have been split with <!--next-page -->. */
	clear: both;
	margin: 0 0 1.5em;
}


/* =Aside Post Format
----------------------------------------------- */

/* Just put ".format-aside" before any of the above classes to create special formatting for Aside posts */

.format-aside .entry-content {
	border-left: 4px solid #000;
	padding-left: 1em;
}


/* =Media
----------------------------------------------- */

/* Styling for images and videos */
.site-header img,
.entry-content img,
.comment-content img,
.widget img {
	max-width: 100%; /* Fluid images for posts, comments, and widgets */
}
.site-header img,
.entry-content img,
.widget-img,
img[class*="align"],
img[class*="wp-image-"],
.wp-caption img {
	height: auto; /* Make sure images with WordPress-added height and width attributes are scaled correctly */
}
.site-header img,
.entry-content img,
.widget img,
img.size-full {
	max-width: 100%;
	width: auto; /* Prevent stretching of full-size images with height and width attributes in IE8 */
}
.entry-content img.wp-smiley,
.comment-content img.wp-smiley { /* Remove borders and backgrounds from WP smileys */
	border: none;
	margin-bottom: 0;
	margin-top: 0;
	padding: 0;
}
.wp-caption { /* The container for image captions */
	max-width: 100%;
}
.wp-caption.aligncenter,
.wp-caption.alignleft,
.wp-caption.alignright,
.wp-caption.alignnone { /* Add spacing around captions and post text */
	margin-bottom: 1.5em;
}
.wp-caption img { /* The image inside the caption container */
	display: block;
	margin: 1.2% auto 0;
	max-width: 98%;
}
.wp-caption-text {
	text-align: center;
}
.wp-caption .wp-caption-text {
	margin: 0.8075em 0;
}
#content .gallery { /* Container for image galleries */
	margin-bottom: 1.5em;
}
.gallery-caption {
	font-style: italic;
}
#content .gallery a img {
	border: none;
	height: auto;
	max-width: 90%;
}
#content .gallery dd {
	margin: 0;
}

/* Make sure embeds and iframes fit their containers */
embed,
iframe,
object {
	max-width: 100%;
}


/* =Navigation
----------------------------------------------- */

/* Older/Newer Post Navigation */

.site-content .site-navigation {

}
.site-content .nav-previous {
	float: left;
	width: 50%;
}
.site-content .nav-next {
	float: right;
	text-align: right;
	width: 50%;
}

/* =Comments
----------------------------------------------- */

#comments { /* Container for the comments section */
	clear: both;
}
.bypostauthor { /* Gives post author comments thier own style */
	
}
.comments-title,
#reply-title {

}
.commentlist li {
	list-style: none;
}
.commentlist,
.children {
	list-style: none;
	margin: 0;
}
.children { /* Nested comments */
	margin: 0 0 0 6%;
}
.commentlist li.comment {  /* Individual top-level comments */

}
.commentlist li.pingback {  /* Individual top-level pingbacks */

}
.commentlist li:last-of-type { /* Do you want to style the last comment differently, such as remove borders? */

}
.commentlist .children li { /* Contains individual nested comments */

}
.children article.comment,
.children li.pingback { /* Nexted comments and pingbacks */
	padding-top: 1.0em;
}
.comment .avatar { /* Comment author's gravatar image */

}
.comment-author { /* Comment author's name */
	
}
.comment-meta { /* Comment date, time, etc */

}
.comment-content { /* Actual comment text */

}
.comment .reply { /* The "Reply" link under each comment */
	text-align: right;
}


/* Comment Form */
.comment-notes,
#commentform .form-allowed-tags,
p.nocomments,
p.logged-in-as,
#commentform label {

}
.required { /* The little asterisk next to a required comment field */
	color: #880000;
}
#commentform label { /* The text next to each comment form field */
	padding: 1em 0;
}
#commentform input[type="text"] {

}
#commentform #comment { /* The comment form textarea */

}
#commentform .form-allowed-tags,
#commentform .form-allowed-tags code {

}
p.nocomments { /* Message displayed when there are no comments */

}


/* =Widgets
----------------------------------------------- */

.widget-area { /* All of the sidebar container divs get this common class */
	
}
.widget { /* The individual widget */
	margin: 0 0 1.5em;
}
.widget-title {

}
.widget ul { /* Unordered lists inside widgets */
	list-style: none;
	margin: 0;
}
.widget ul li { /* Unordered list items inside widgets */
	margin-bottom: 0.25em;
}

/* Search widget */
#searchsubmit {
	display: none;
}
.widget_search #s {

}

/* Sub-Items in Menu & Categories Widgets. These classes are useful if you want to add special styling, such as indention, to sub-items in your menu and categories widgets. */
.widget-area .sub-menu,
.widget-area .children { 
	margin-left:  1.5em;
}
.widget-area .sub-menu li,
.widget-area .children li {

}

/* Text Widgets */
.widget p,
.textwidget {

}
.widget p a,
.textwidget a {

}

/* Cloud Widgets */
.wp_widget_tag_cloud div,
.widget_tag_cloud div {
	line-height: 1.5;
	padding: 0.231em 0;
}

/* RSS Widget */
.rsswidget img { /* This is the orange RSS icon to the left of the RSS widget title */
	margin: 0;
	vertical-align: text-top;
}
.rss-date {

}
.rssSummary {

}

/* Calendar Widget */
#wp-calendar {
	width: 100%;
}
#wp-calendar caption {
	font-style: italic;
}
#wp-calendar thead th {
	text-align: center;
}
#wp-calendar tbody,
#wp-calendar tbody td {
	border: 1px solid #000;
}
#wp-calendar tbody {
	border-left-width: 0;
}
#wp-calendar tbody td {
  	border-width: 1px 0 0 0;
}
#wp-calendar tbody td a {
	font-weight: bold;
}
#wp-calendar tbody td:hover {

}
#wp-calendar tfoot #next {
	text-align: right;
}
#wp-calendar #today {
	font-weight: bold;
}
#wp-calendar #prev,
#wp-calendar #next {

}
#wp-calendar tbody .pad {

}


/* =Site Footer
----------------------------------------------- */

.site-footer {

}
.site-info {

}


/* =Responsive Structures
----------------------------------------------- */

@media only screen and (max-width: 768px) {
	#content,
	#primary,
	#secondary,
	#tertiary { /* Remove floats on all structural elements for smaller screens */
		float: none;
		margin: 0;
		padding: 0;
	}
	#primary,
	#secondary,
	#tertiary { /* Make all structural elements full-width */
		width: 100%;
	}
}


/* =IE Styling
----------------------------------------------- */

/* If you have any IE-specific adjustments to make, add them here. 

For example: 

#ie8 body {
	color #333;
}

Will make the sbody text #333 on IE8 only. In order for this to work, you need to set up conditionals to add an ID-selector to the HTML element when IE is detected. For instructions on how to set up the conditionals, see: http://themeshaper.com/2012/10/31/the-wordpress-theme-header-template/
*/