html, body {
    margin: 0;
    padding: 0;
    font-family: "Inter", Arial, Helvetica, sans-serif;
}

body {
    display: flex;

    align-items: center;
    justify-content: center;

    width: 100vw;
    height: 100vh;
}

#keyboard {
    display: flex;
    gap: 0.25rem;
    flex-direction: column;
}

.row {
    display: flex;
    gap: 0.25rem;
    flex-direction: row;
}

.row:nth-child(2) {
    margin-left: 2rem;
}

.row:nth-child(3) {
    margin-left: 4rem;
}

.row:nth-child(4) {
    margin-left: 6rem;
}

.key {
    position: relative;

    display: flex;
    align-items: center;
    justify-content: center;

    border: 1px solid black;
    width: 4rem;
    height: 4rem;
}

.key.down {
    color: white;
    background-color: black;
}

.key_name {
    position: absolute;
    right: 0.25rem;
    bottom: 0.25rem;
    font-size: 0.75em;
}