body {
    padding: 0;
    margin: 0;
    height: 100vh;
    display: grid;
    grid: auto auto / auto;
    background-color: burlywood;
}

main {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

section {
    display: flex;
    align-items: center;
}

section > canvas,
input,
#mixer > p {
    padding: 5px;
    margin: 5px;
    border-radius: 10px;
    background-color: white;
}

input {
    width: 40px;
}

section > input {
    margin: 0 40px;
}

footer {
    align-self: flex-end;
    display: flex;
    padding: 10px;
    justify-content: center;
    background-color: gray;
}

footer > * {
    text-decoration: none;
    color: white;
    margin: 0 50px;
}