figure {
    text-align: center;
}

figcaption {
    text-align: center;
    font-style: italic;
}

#background-grid {
    position: fixed;
    inset: 0;
    z-index: -2;
    display: block;
}

#header-faces {
    margin-top: 20px;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    flex-wrap: wrap;
}

.square {
    width: 20px;
    height: 20px;
}

#main-container {
    margin: 8rem;
    padding: 0;
    text-align: center;
}

main {
    margin: 0 auto;
    text-align: left;
    background-color: #F6F4F3;
    padding: 3rem 4rem;
    font-family: Arial, Helvetica, sans-serif;
    box-shadow: 0 4px 8px 4px rgba(0, 0, 0, 0.2), 0 6px 20px 4px rgba(0, 0, 0, 0.19);
    max-width: 800px;
}

img {
    margin: auto;
}

img.i30 {
    width: 30%;
}

img.i70 {
    width: 70%;
}

img.i80 {
    width: 70%;
}

img.i100 {
    width: 100%;
}

h1 {
    text-align: center;
    margin-bottom: 2.5rem;
}

.infobox {
    margin: 16px;
    background-color: #dae3bd;
}

@media screen and (max-width: 768px) {
    #main-container {
        margin: 8rem 0rem;
    }

    main {
        padding: 2rem;
        max-width: none;
    }

    h1 {
        margin: auto;
    }

    body {
        margin: auto;
    }

    img.i30,
    img.i70,
    img.i80 {
        width: 100%;
    }
}

@media screen and (max-width: 430px) {
    .infobox {
        margin: 0px;
    }
}


hr {
    border: 2px ridge #3E442B;
    border-radius: 2px;
}


pre {
    overflow: scroll;
    padding: 1rem;
    border-radius: .2rem;
    background-color: #ffffff;
    border: 1px solid #3e442b88;
    overflow: auto;
}

.sample-face {
    content: url(img/face_offwhite.png)
}

table {
    width: 90%;
    margin: 10px auto;
    border-collapse: collapse;
    border-top: 1px solid #999999;
    border-bottom: 1px solid #999999;
}

tr {
    border-top: 1px solid #999999;
}

th,
td {
    padding: 0.4em;
}

/* Heading Links */
.anchor {
    opacity: 0;
    margin-left: -1em;
    text-decoration: none;
    color: inherit;
}

h2:hover .anchor,
h3:hover .anchor,
h4:hover .anchor {
    opacity: 1;
}