body {
    margin: 4rem auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    color: #333333;
    max-width: 768px;
    line-height: 1.5;
}

pre {
    padding: .5rem;
    overflow: scroll;
    border-radius: 3px;
}

@media (max-width: 768px) {
    body {
        margin: 4rem 20px;
    }
}

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

a {
    color: #333333;
}

a:hover {
    text-decoration: none;
}

.main-nav {
    margin-bottom: 40px;
}
.main-nav a {
    margin: 0 15px;
}

.main-nav a:first-child {
    margin-left: 0;
}