* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
}

h2 {
    color: blue;
    width: 100%;
    text-align: center;
    margin: 2em;
}

#container {
    width: 100vw;
    height: 100vh;
    border: thin solid black;
}

#line {
    height: 3em;
}