*{
    font-family: monospace;
}
body{
    background-color: #eee;
}

header{
    width: min(90vw, 800px);
    margin: 2rem auto;
}

footer{
    text-align: center;
}
#container{
    margin:auto;
    display: flex;
    width: min(90vmin, 800px);
    aspect-ratio: 1/1;
    flex-direction: column;
    background-color: #fff;
}
.row{
    display: flex;
    flex: 1;
}

.col{
    flex: 1;
}