Readability CSS

style.css

html {
	color: #444;
	background: #FDFDFF;
	font-family: 'Helvetica Neue', HelveticaNeue, sans-serif;
	font-size: 16px;
	line-height: 1.618em;
	margin: 0 auto;
	max-width: 50em;
	text-rendering: optimizeLegibility;
}

h1,h2,h3,h4,h5,h6 {
	margin: 2em 0 .5em;
	max-width: 35em; /* 35-60em */
	color: #000;
	line-height: 1;
}
h1 {
	font-size: 1000%;
	margin: .5em;
	text-align: center;
	text-shadow: 0 0.1em 1em #b4e7f8;
	color: white;
	letter-spacing: -.1em;
	text-transform: capitalize;
}
h2 {
	font-size: 400%;
	font-weight: 100;
}
h2 small,
h3 small,
h4 small,
h5 small,
h6 small {
	font-size: 50%;
	opacity: .5;
}
h3 { font-size: 250%; }
h4 { font-size: 200%; }
h5 { font-size: 150%; }
h6 { font-size: 130%; opacity: .9; }

p, li, td, th {
	margin: 0.8125em 0;
	max-width: 40em;
	text-align: justify;
	line-height: 1.66;
	font-size: 18px;
}
li {
	list-style-type: circle;
}
strong,b,i,em,th {
	color: #000;
}
blockquote {
	width: 120%;
	margin: auto -15%;
}
blockquote p {
	max-width: 50em;
	font-size: 200%;
	font-style: italic;
	line-height: 1.33;
	text-align: center;
}
section {
	background: #eee;
	padding: 2em;
	opacity: .8;
	border-radius: .3em;
}
section *:first-child {
	margin-top: 0;
}

a {
	color: inherit;
	border-bottom: 3px solid #b4e7f8;
	text-decoration: none;
}

a:hover {
	background: #b4e7f8;
}

mark {
	padding: .1em .2em;
	background-color: bisque;
	border-radius: 0.3em;
	font-size: 105%;
}

table {
	width: 120%;
	margin: auto -10%;
	border: 2px solid #ccc;
	background-color: #fbfbfb;
}

table th,
table td {
	padding: .5em;
	text-align: left;
	vertical-align: top;
}
img {
	max-width: 100%;
}