body {
    font-size: 100%;
}
img {
    width: 100%;
    height: auto;
}
figcaption {
    font-size: 2vw;
    color: green;
    text-align: center;
}
hr {
    border: 1vw solid green;
    border-radius: 5px;
}
.small_ruler {
    border: 0.1vw solid green;
    border-radius: 5px;
}
h1 {
    text-align: center;
    color: green;
}
.centered_200 {
    text-align: center;
    font-size: 200%;
}