style.css

html {
    background: #fafafa;
    color: #444;
    text-align: center;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 20px;
    letter-spacing: -0.01em;

    height: 100%;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

input[type=search] {
    font: inherit;
    font-size: 90%;
    background: #fafafa;
    border: 1px solid #ccc;
    color: #444;
    border-radius: 6px;
    padding: 12px;
}

input[type=search]:focus-visible {
    outline: 2px solid #36e;
    border-color: #36e !important;
}

main {
    margin: 3em 0.6em;
}

h1 {
    font-size: 300%;
    font-weight: bold;
    margin: 0 0 0;
}

h1 > img {
    width: 12rem; height:  auto;
    max-width: 100%;
    border: 1px solid #0002;
    border-radius: 100%;
    margin:  0 0 0.5rem;
}

p { margin: 1.5rem 0; }

p.small {
    font-size: 65%;
    color: #aaa;
}

a {
    color: #36e;
    text-decoration: none;
}
a:hover { text-decoration: underline; }

form { padding-top: 0.2em; }

@media (prefers-color-scheme: dark) {
    html {
        background: #222;
        color: #ccc;
    }

    img {
        filter: brightness(0) invert(1) brightness(0.85);
        border-color: #000;
    }

    input[type=search] {
        background: #222;
        border: 1px solid #444;
        color: #ccc;
    }

    p.small {
        color: #666;
    }
}