html {
    height: 100vh;
}

body {
    background: rgb(200, 200, 200);
    height: 100%;
    margin: 0;
    display: flex;
    flex-flow: column;

}

header {
    flex: 0 1 auto;
    padding: 5px;
    height: max-content;
    overflow: hidden;

    >* {
        float: left;
        height: min-content;
        width: fit-content;
    }

    >img {
        max-width: 100%;
    }

    >nav {
        min-width: 200px;
    }

}

main {
    flex: 1 1 auto;
    padding: 5px;
    height: auto;
}