contrast-hugo/static/css/theme.css

@media (prefers-color-scheme: dark) {
    html {
        background: #282828;
        color: #fff;
    }
}

body {
    font-family: system-ui,-apple-system,"Helvetica Neue","Segoe UI",sans-serif;
    font-size: 16px;
    font-size: calc(0.8em + 0.25vw);
    font-weight: 400;
    line-height: 1.65;
    color: #282828;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body, blockquote, figure {
    margin: 0;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 400;
}

b, strong, th {
    font-weight: 500;
}

a {
    color: inherit;
    text-decoration: inherit;
    transition: color .2s;
}

a:hover {
    color: #949494;
}

article a {
    color: #68f;
}

article header a, article footer a {
    font-weight: inherit;
    color: inherit;
}

header time {
    color: #949494;
}

hr {
    border: 1px solid #9494944d;
    margin: 2em 0;
}

blockquote {
    background: #9494940f;
    border-left: 4px solid #68f;
    padding: 1px 1.5em;
}

img {
    border-radius: 2px;
    max-width: 100%;
    height: auto;
    margin: .5em 0;
}

table {
    border-spacing: 1px;
    box-shadow: 0px 0px 0px 1px #94949429 inset;
}

tr:hover, tr:nth-child(even) td {
    background: #9494940f;
}

th {
    background: #9494941a;
    text-align: inherit;
}

th, td {
    box-shadow: 0px 0px 0px 1px #94949429;
    padding: .5em 1em;
}

pre {
    background: #94949414;
    border-radius: 2px;
    font-size: .8em;
    margin: 1.5em 0;
    padding: .8em 1.2em;
    white-space: pre-wrap;
}

p code {
    background: #94949426;
    opacity: .75;
    border-radius: 2px;
    font-size: .9em;
    margin: 0 .1em;
    padding: .2em .4em;
}

body > header, body > footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
}

body > header, article, body > footer {
    padding: 1.5em calc(34% - 12rem);
}

@media (max-width: 40em) {
    body > header, article, body > footer {
        padding: 1.5em 1em;
    }
}

article, body > footer {
    border-top: 1px solid #9494941f;
}

body > header.bright {
    box-shadow: 0 0 1em #3c3c3c0f;
}

body > header.dark {
    background: #2b2b2b;
    color: #fff;
}