body{font-family:Arial,Helvetica,sans-serif;line-height:1.7;margin:40px;color:#222;}
h1,h2,h3{color:#1a3d6d;}
a{color:#0b65c2;text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;margin:20px 0;}
.toc{background:#f4f6f8;padding:20px;border-left:5px solid #1a3d6d;}
.section{margin-top:50px;}