[Markdown Style : SIXSIDED] A general-purpose Markdown stylesheet, created for my own use in Markdown Pad 2.

sixsided.css

/**
 * SIXSIDED : a general-purpose Markdown stylesheet
 * ----------------------------------------------------------------------
 * Originally made for use with MarkdownPad (http://markdownpad.com).
 *
 * Mostly based on Nicolas Hery's stylesheet for MDPad2, available at:
 * https://github.com/nicolashery/markdownpad-github
 *
 * Author: Fabio Y. Goto - https://yuiti.com.br | https://github.com/yuigoto
 * Version: 1.0.0
 */

*,
*:after,
*:before {
  border: 0;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* BODY
 * ---------------------------------------------------------------------- */
html {
  font-size: 16px;
}

body {
  color: #4b504a;
  background-color: #fff;
  max-width: 960px;
  font-family: 'Inter', 'Inter UI', sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  font-size: 1rem;
  line-height: 1.6;
  margin: 0 auto;
  padding: 20px;
}

body > *:first-child {
  margin-top: 0 !important;
}

body > *:last-child {
  margin-bottom: 0 !important;
}

/* BLOCKS
 * ---------------------------------------------------------------------- */
p,
blockquote,
ul,
ol,
dl,
table,
pre {
  margin: 1rem 0;
}

/* HEADINGS
 * ---------------------------------------------------------------------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  margin: 1.5rem 0 1rem;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

h1 tt,
h1 code,
h2 tt,
h2 code,
h3 tt,
h3 code,
h4 tt,
h4 code,
h5 tt,
h5 code,
h6 tt,
h6 code {
  font-size: inherit;
}

h1 {
  border-bottom: 3px solid #d5ddd9;
  font-size: 2.5rem;
}

h2 {
  border-bottom: 1px solid #d5ddd9;
  font-size: 2.0rem;
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  color: #8d928b;
  font-size: 1.125rem;
}

body > h2:first-child,
body > h1:first-child,
body > h1:first-child + h2,
body > h3:first-child,
body > h4:first-child,
body > h5:first-child,
body > h6:first-child {
  margin-top: 0;
  padding-top: 0;
}

a:first-child h1,
a:first-child h2,
a:first-child h3,
a:first-child h4,
a:first-child h5,
a:first-child h6 {
  margin-top: 0;
  padding-top: 0;
}

h1 + p,
h2 + p,
h3 + p,
h4 + p,
h5 + p,
h6 + p {
  margin-top: 1rem;
}

/* LINKS
 * ---------------------------------------------------------------------- */

a {
  color: #8aaccf;
  text-decoration: none;
}

a:hover {
  color: #4b7cb7;
  text-decoration: underline;
}

/* LISTS
 * ---------------------------------------------------------------------- */
ul,
ol {
  margin-bottom: 1rem;
  padding-left: 2.5rem;
}

ul li > :first-child,
ol li > :first-child,
ul li ul:first-of-type,
ol li ol:first-of-type,
ul li ol:first-of-type,
ol li ul:first-of-type {
  margin-top: 0;
}

ul ul,
ul ol,
ol ol,
ol ul {
  margin-bottom: 0;
}

dl {
  padding: 0;
}

dl dt {
  font-size: 1.125rem;
  font-weight: 700;
  font-style: italic;
  margin: 1rem 0 .5rem;
  padding: 0;
}

dl dt:first-child {
  padding: 0;
}

dl dt>:first-child {
  margin-top: 0;
}

dl dt>:last-child {
  margin-bottom: 0;
}

dl dd {
  margin: 0 0 1rem;
  padding: 0 1rem;
}

dl dd>:first-child {
  margin-top: 0;
}

dl dd>:last-child {
  margin-bottom: 0;
}

/* CODE
 * ---------------------------------------------------------------------- */
pre, code, tt, kbd {
  font-size: .9rem;
  font-family: 'CamingoCode', 'Liberation Mono', Courier, monospace;
}

code, tt {
  background-color: #e7f0f5;
  border: 1px solid #d5dddf;
  border-radius: .25rem;
  margin: 0;
  padding: 0;
  white-space: nowrap;
}

pre > code {
  border: none;
  background-color: transparent;
  white-space: pre-wrap;
  word-wrap: break-word;
  margin: 0;
  padding: 0;
}

pre {
  background: #e7f0f5;
  border: 1px solid #d5dddf;
  font-size: .9rem;
  line-height: 1.5em;
  padding: .6rem 1rem;
  overflow: auto;
  border-radius: .25rem;
}

pre code, pre tt {
  background-color: transparent;
  border: none;
}

kbd {
  color: #697166;
  background-color: #e7f0f5;
  border: 1px solid #c5cbcb;
  padding: .25rem .5rem;
  border-radius: .25rem;
  box-shadow: 0 .25rem 0 0 #c5cbcb;
}

/* QUOTES
 * ---------------------------------------------------------------------- */

blockquote {
  border-left: .25rem solid #d5dddf;
  color: #9fa5a3;
  padding: 0 1rem;
}

blockquote > :first-child {
  margin-top: 0;
}

blockquote > :last-child {
  margin-bottom: 0;
}

/* HORIZONTAL RULERS
 * ---------------------------------------------------------------------- */

hr {
  background: transparent;
  border-bottom: 1px solid #d5dddf;
  height: 0;
  margin: 1rem 0 2rem;
  padding: 0;
  display: block;
  clear: both;
  overflow: hidden;
}

/* TABLES
 * ---------------------------------------------------------------------- */

table {
  border-collapse: collapse;
  margin: 1rem 0 1rem;
}

table th {
  background-color: #e7f0f5;
  font-weight: 700;
}

table th,
table td {
  border: 1px solid #c5cbcb;
  padding: .5rem 1rem;
}

table tr {
  border-top: 1px solid #c5cbcb;
  background-color: #fff;
}

table tr:nth-child(2n) {
  background-color: #fafafa;
}

/* IMAGES
 * ---------------------------------------------------------------------- */
img {
  max-width: 100%;
  margin: 0 auto 1rem;
}

img:last-child {
  margin: 0;
}