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

/*
html {
    width: 100%;
    height: 100vh;
    border: 2px solid darkslategrey;
}
    */

body {
	background-color: hsl(0 0 10);
	font-family: sans-serif;
    margin: 0px;
    padding: 0px;
    border: 5px solid darkred;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 5px solid darkcyan;
    width: 100%;
    height: 100vh;
}

.center {
    width: 200px;

    background-color: hsl(0 0 60);
    border: 5px solid darkgreen;

    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.center > * {
    width: 200px;
    border: 5px solid darkgoldenrod;
    flex: 0 0 auto;
    min-width: 50px;
    text-align: center;
}