:root {
    --size-large: 64px;
    --size-normal: 48px;
    --size-small: 32px;
    --width-limit: 720px;
    --radius-normal: 8px;
    --transition-duration: 0.2s;

    --color-black: black;
    --color-gray: dimgray;
    --color-smoke: whitesmoke;
    --color-white: white;

    --color-hover: #ebebeb;
    --color-active: #e1e1e1;
    --color-border: #c3c3c3;
    --color-link: darkblue;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-black: whitesmoke;
        --color-gray: darkgray;
        --color-smoke: #2e2e2e;
        --color-white: #121212;

        --color-hover: #383838;
        --color-active: #424242;
        --color-border: #606060;
        --color-link: royalblue;
    }
}

* {
    box-sizing: border-box;
    text-align: justify;
}
html, body {
    width: 100%;
    margin: 0px;
}
body {
    position: relative;
    display: flex; flex-direction: column;
    font-family: sans-serif;
    font-size: 16px;
    font-weight: normal;
    line-height: 1.8; letter-spacing: 0em;
    color: var(--color-black); background-color: var(--color-white);
}
header {
}
main {
    position: relative;
    width: 100%; height: 100%;
    display: flex; flex-direction: column; justify-content: start; align-items: center;
}
footer {
}
div {
    -webkit-tap-highlight-color: transparent;
}
a {
    color: var(--color-link);
}

.content {
    width: 100%; max-width: var(--width-limit); padding: 16px;
}