*{
    margin:0;
    padding:0;
    background-image: url("https://cdn.pixabay.com/photo/2017/08/06/06/02/people-2589308_1280.jpg");
}
.keys{
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.key{
    height: 100px;
    width:100px;
    border: 3px solid black;
    margin: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: rgba(241, 49, 81, 0.4);
    margin: 1rem;
    transition: all .07s ease;
}
kbd{
    font-size: 2.5rem;
    font-weight: 600;
    background: none;
}

.sound{
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: .1rem;  
  color: rgb(239, 165, 180);
  background: none;
}

.playing{
    transform: scale(1.1);
    border-color: #e6124a;
  box-shadow: 0 0 1rem #f34617;
}