:root {
    --bg: black;
    --fg: white;
    --color: #060;
}

* {
	box-sizing: border-box
}

body {
    background-color: var(--bg);
    color: var(--fg);
    font-family: sans-serif;
}
main {
    width: 800px;
    margin: 0 auto;
}

/* dropdowns */
summary {
    background-color: var(--color);
    height: 2em;
    padding: 0.35em 0.5em;
    cursor: pointer;
}
details {
    margin-bottom: 0.5em;
}
details div {
    outline: 2px var(--color) solid;
    outline-offset: -2px;
    padding: 1em;
}

/* links */
a:link { color: deepskyblue; }
a:visited { color: mediumorchid; }