pre {
    display: block;
    margin: 0 0 14px;
    padding: 15px;
    border-radius: 3px 3px 3px 3px;
    font-size: 14px;
    line-height: 28px;
    background-color: #f5f5f5;
    white-space: pre;
    white-space: pre-wrap;
    word-break: break-all;
    word-wrap: break-word;
}
img {
    display: block;
    margin: 0;
    border-radius: 5px;
}
#table-of-contents {
    display: none;
}
body{
    margin:40px auto;
    max-width: 750px;
    line-height:1.6;
    font-size:18px;
    color: #444444;
    background-color: #eeeeee;
    padding:0 10px
}
h1,h2,h3{
    line-height:1.2
}