body{
    margin:40px auto;
    max-width:650px;
    line-height:1.6;
    font-size:18px;
    color:#444;
    padding:0 10px
}

h1,h2,h3 {
    line-height:1.2
}

.no-select {
    -moz-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
}