body{max-width:46em;margin:2em auto;padding:0 1em;font:17px/1.55 Georgia,"Times New Roman",serif;color:#111}
h1{font-size:1.7em;line-height:1.2} h2{margin-top:2em;border-bottom:1px solid #ccc} h3{margin-top:1.5em}
img{max-width:100%;display:block;margin:1em auto} table{border-collapse:collapse;margin:1em auto;font-size:.9em}
td,th{border:1px solid #bbb;padding:.25em .6em} code{font-size:.85em;background:#f4f4f4;padding:0 .2em}
pre{background:#f4f4f4;padding:.8em;overflow-x:auto;font-size:.8em} em{color:#222} .nav{font-size:.85em;color:#555}