snake.css

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
}

body {
    background: black;
    min-width: 260px;
    min-height: 320px;
}

.container {
    width: 100%;
    height: 100%;
    padding: 5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}


canvas {
    flex: 0 0 75%;
    border: 1px solid white;
}

.besturing {
    flex: 0 0 22%;
    display: flex;
    justify-content: space-between;
}
.besturing button{
    font-size: 2rem;
}
.besturing > * {
    flex: 0 0 30%;
}

.besturing > .bovenBeneden {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.besturing > .bovenBeneden > button {
    flex: 0 0 45%;
}

@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }
}

@media (max-height: 600px) {
    .besturing button{
        font-size: 1rem;
    }

    .container {
        padding: 1rem;
    }
}