html {
    height: 100%;
}
body {
    height: 100%;
    background-color: ivory;
}
footer {
    font-size: medium;
    font-weight: bold;
    text-align: center;
}
text {
    color: darkslategrey;
}
#index {
    min-height: 100%;
    width: 100%;
    background-image: url("../images/background.jpg");
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}
#diagram {
    background-color: white;
}