body {
    font-family: sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background: darkgrey;
}

#canvas {
    background: gray;
    width: 800px;
    height: 600px;
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.card {
    background: white;
    position: absolute;
    font-size: 1.25em;
    width: 8em;
    padding: 0.5em;
    box-shadow: 0.25em 0.25em black;
    cursor: pointer;
    user-select: none;

    &:active {
        background: lightgrey;
        z-index: 1;
    }
}