body {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    background-color: black;
    align-items: center;
    height: 100vh;
    margin: 0;
}

iframe {
    width: 80%;
    height: 400px;
    border: 0px solid #ccc;
    margin-top: 20px;
    display: block;
}

#button-table {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 2px;
    margin-top: 20px;
    width: 60%;
    background-color: #898989;
}

.key-button {
    width: 100%;
    aspect-ratio: 1 / 1;
    text-align: center;
    line-height: 100%;
    font-size: 12px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #000000;
    cursor: pointer;
    user-select: none;
}

.key-button.active {
    background-color: #8ab4f8;
    color: white;
}