:root {
    height: 100%;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    height: 100%;
    margin: 0;
}

header {
    height: 5vmin;
    text-align: center;
}

h1 {
    margin: 0;
    font-size: 4vmin;
}

.minefield {
    height: 100%;
    max-width: 90vmin;
    max-height: 90vmin;
    margin: auto;
    display: flex;
    flex-direction: column;
    user-select: none;
}

.minefield > div {
    display: flex;
    flex-direction: row;
    flex: 1;
}

.minefield img {
    flex: 1;
    image-rendering: pixelated;
}

footer {
    text-align: center;
    margin: 1vmin;
}

footer button {
    font-size: 2vmin;
}