body {
    background-color: black;
    color: white;
    font-family: serif;
}
a {
    color: white;
}
main {
    margin: 0 auto;
    width: 100%;
    height: calc(100% - 4rem);
    position: fixed;
    top: 2rem;
    bottom: 2rem;
    overflow: auto;
    text-align: center;
}
#right {
    display: inline-block;
    border: 1px gray solid;
    margin: 1rem;
    margin-left: 0;
}
#left {
    display: inline-block;
    border: 1px gray solid;
    margin: 1rem;
    margin-right: 0;
}