:root {
    --r-background-color: black;
    --r-heading1-size: 2.25em;
    --r-heading2-size: 1.5em;
    --r-heading-text-transform: none;
}

.reveal pre {
    width: 95%;
    box-shadow: 0px 5px 15px rgba(100, 100, 100, 0.3);
    font-size: 0.5em;
}

.example::before {
    content: "⇒ ";
    color: gray;
    position: absolute;
    left: -1em;
}