body{
    margin: 0;
    box-sizing: border-box;
    align-items: center;
}

.keys{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 400px;
    background-color: #333;
}

.key{
    padding: 5px;
    margin: 5px;
    text-align:center;
    min-width: 50px;
    max-width: 100px;
    min-height: 50px;
    max-height: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 5px;
    border: 2px solid black;
    background-color: transparent;
    transition: all 0.07s;
}

.key kdb{ 
    color: whitesmoke;
    font-size: 20px;
}

.key span{
    color: #ffc600;
}

.playing{
    transform: scale(1.1);
    border-color: #ffc600;
    box-shadow: 0 0 10px #ffc600;
}