style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}
html{
    font-size: 0.625rem;
}
body {
    font-family: 'Lora', serif;
    text-align: center;
}
div.image{
    width: 100%;
    height: 100%;
    position: absolute;
    top:0;
    left: 0;
    right: 0;
    z-index: -99;
    filter: blur(2px);
}
div.image>img{
    width: 100%;
    height: 100%;
    filter: brightness(50%);
}
h1{
    margin: 5rem 0;
    letter-spacing: 0.4rem;
    color: white;
    font-size: 5rem;
}

div.keys {
    font-weight: bold;
    font-size: 2rem;
    color: white;
    margin: 30rem auto 0 auto;
}
div.key{

    margin:0 2rem;
    border: 3px solid white;
    padding: 2rem 3rem;
    transition: all .07s;
    display: inline-block;
    
}
.bkey{
    background: rgba(0, 0, 0, .5);
}
div.key:hover{
    cursor: pointer;
}
div.key[data-key="32"]{
    margin: 2rem auto;
    display: block;
    width: 38.8rem;
    letter-spacing: 0.2rem;
    padding: 2rem 2rem;
}
div.key>p{
    font-size: 1rem;
    font-weight: lighter;
    letter-spacing: 0.2rem;
    margin: 1rem 0 0 0;
}
.playing{
    background: yellow;
    color: black;
    transform: scale(1.3);
    box-shadow: 0 0 40px 12px yellow;
    
}