html {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 12pt;
    line-height: 1.3;
}

body {
    margin-left: auto;
    margin-right: auto;
    width: 90%;
    max-width: 40rem;
}

article {
    margin: 5rem 0;
}

section {
    margin: 3rem 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: normal;
}

img {
    max-width: 100%;
}

article>h1 {
    font-weight: bold;
}

samp {
    display: block;
    margin: 1em 0;
}

code,
kbd {
    color: steelblue;
    font-style: normal;
    font-weight: normal;
}

code.tag::before {
    content: "<";
}

code.tag::after {
    content: ">";
}

ol.instructions {
    background-color: #f2f2f2;
    padding: 1rem 1rem 1rem 2rem;
    color: #666666;
    font-style: italic;
    font-size: 0.8rem;
    line-height: 1.2;
}

ol.instructions>li {
    margin: 0.4rem 0;
}

ol.instructions>li:first-child {
    margin-top: 0;
}

ol.instructions>li:last-child {
    margin-bottom: 0;
}

.two-columns-example>* {
    padding: 1rem;
    font-family: Georgia, 'Times New Roman', Times, serif;
    font-size: 0.8rem;
    color: white;
}

.two-columns-example> :first-child {
    background-color: rgb(34, 57, 139);
}

.two-columns-example> :last-child {
    background-color: rgb(20, 35, 83);
}

@media (min-width: 640px) {
    html {
        font-size: 16pt;
    }

    .two-columns-example {
        display: flex;
    }

    .two-columns-example > * {
        width: 50%;
    }
}