style.css

html{
    font-size: 10px;
    background: url(./pexels-gtar.jpg) bottom center;
    background-size: cover;
    
}

body, html{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}
.heading{
    display: flex;
    flex: 1;
    align-items: flex-start;
    justify-content: space-around;
    position: fixed;
    overflow: hidden;
    top: 70vh;
}
.heading h1{
    color: #6F8FAF;
    font-family: cursive;
    margin-left: 35vw;
    font-size: xxx-large;
}
.keys{
    display: flex;
    flex: 1;
    min-height: 100vh;
    align-items: flex-end;
    justify-content: space-around;
}

.key{
    border: .4rem solid #4e332c;
    border-radius: .5rem;
    margin: 1rem;
    font-size: 1.5rem;
    padding: 1rem .5rem;
    transition: all 3.07s ease;
    width: 10rem;
    text-align: center;
    color: #6F8FAF;
    background: rgba(0, 0, 0, 0.4);
    text-shadow: 0 0 .5rem black;
}

.playing{
    transform: scale(1.1);
    border-color: peachpuff;
    box-sizing: 0 0 1rem #ffc600;
}

kbd{
    display: block;
    font-size: 4rem;
}

.sound{
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: .1rem;
    color: #8b655a;
}