index.css

a{
    color: #4c4;
}
body{
    background-color: #000;
    color: #ccc;
    font: 700 14px monospace;
    margin: 8px;
}
div{
    display: inline-block;
    vertical-align: top;
}
.external{
    color: #f99;
}
.external::after{
    content: "↗";
}
ul{
    margin: 0;
    padding-left: 20px;
}

a:focus{
    outline: 2px solid #4c4;
}
a:hover{
    color: #07f;
}