body {
    margin: 10%;
    font-family: sans-serif;
    justify-content: center;
    font-size: 18px;
}

video {
    width: 100%;
    height: auto;
}

.video-grid {
    display: flex;
    flex-flow: row wrap;
    justify-content: space-evenly;
}

.video-grid > div {
    max-width: 550px;
    height: auto;
    padding: 10px;
}

img {
    max-width: 500px;
    width: 100%;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

img.table {
    max-width: none;
}

.displaymath {
    font-size: 24px;
    margin-bottom: 10px;
}

h1 {
    font-size: 44px;
    text-align: center;
}

h2 {
    font-size: 24px;
    text-align: center;
}

h3 {
    font-size: 24px;
    text-align: left;
    margin-top: 50px;
}

p, li {
    text-indent: none;
    font-size: 18px;
}