* {
    box-sizing: border-box;
    border: 1px solid grey;
}

.eleventy-font-sized {
    font-size: 5rem;
}

strong {
    color: #ec400c;
}

.dark-region {
    background-color: #000;
    color: #fff;
}

.foo {
    margin: 2rem;
}
.foo:hover {
    /* when hovered */
    background-color: red;
}
.foo > button {
    /* selector equls to .some-class > button */
    border: 20px solid #9ad60f;
}
.foo-cool {
    /*** Notice this! ****/
    background-color: red;
    color: white;
}

.boo {
    background: url(/images/icon.svg?ca9862738da9e44e94943306d154e0e3) no-repeat;
    padding-left: 200px;
}