:root {
    background-color: black;
    color: white;
    font-size: 18px;
    line-height: 1.2;
    font-size-adjust: 0.5;
    font-family: sans-serif;
    text-align: center;
    overflow: hidden;
}

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: row;

    & > * { border: 2px solid hsl(0 0 30); }

    & > nav {
        width: 160px;
        flex-grow: 0;
    }

    & > main {
        flex-grow: 1;
    }

    & > aside {
        width: 160px;
        flex-grow: 0;
    }
}