#mondriaan-container {
    width: 50vw;
    aspect-ratio: 4 / 3;
    background-color: black;
    display: grid;
    grid-template-columns: 1fr 2fr 5fr 2fr 4fr 1.5fr 1fr;
    grid-template-rows: 2fr 2fr 1fr 1fr;
    gap: 1vh;
}

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgb(213, 230, 216);
}

div {
    background-color: white;
}

.yellow {
    background-color: #fac901;
}

.red {
    background-color: #dd0100;
}

.blue {
    background-color: #225095;
}

.column-span-2 {
    grid-column-end: span 2;
}

.row-span-2 {
    grid-row-end: span 2;
}