#matrix {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.row {
    display: flex;
    width: 254px;
    gap: 2px;
}

.led {
    width: 30px;
    height: 30px;
    border: 1px solid gray;
    background-color: whitesmoke;
    cursor: pointer;
    border-radius: 2px;
}

.led.on {
    background-color: blue;
}

button {
    width: 100px;
    margin-top: 1rem;
    /* flex: 1 1 auto; */
}
