body{
    font-size:1em
}
h1{
    background-color:#f1f1f1;
    padding:8px
}
h2{
    background-color:#f1f1f1
}
h3,h4{
    width:50%;
    background-color:#f1f1f1;
}
a{
    text-decoration:none;
    font-weight:bold
}
main{
    max-width: 811px;
    padding-left: 4px;
    padding-right: 10px;
    margin: auto;
    background-color:white;
    padding-bottom:100px
}
div{
    max-width:811px
}
code{
    font-family:Courier;
    font-size:1em;
    background-color:#e6e6e6;
    padding-left:4px;
    padding-right:4px;

}
.y{
    background-color:black;
    color:white;
}
.x{
    background-color:black;
    color:yellow;
}
.w{
    background-color:yellow;
}
pre{
    background-color:#f7f7f7;
    font-family:Courier;
    font-size:0.8em;
}