html, body {
    height: 100%;
}
body {
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: url('../img/gv1t8booaus-freestocks-org.jpg');
    background-size: cover;
}
.drumpad-wrapper {
    margin: 0px auto;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    background-color: rgba(255,255,255,0.2);
}
.drum {
    width: 65px;
    border: 3px solid #000;
    background-color: rgba(0,0,0,0.6);
    color: #fff;
    border-radius: 5px;
    height: 65px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-right: 24px;
    transition: all 0.1s;
}
.letter {
    font-size: 1.25em;
}
.subtitle {
    font-size: 0.95em;
    color: yellow;
}
.active {
    transform: scale(1.2);
    background-color: rgba(0,0,0,0.8);
    border: 3px solid yellow;
}