html, body {
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body {
    background-color:#222;
    color:#dedede;
}

.container {
    display:flex;
    justify-content:center;
    align-items:center;
    width:100vw;
    height:100vh;
    text-align:center;
}