.z {
    background-color: white;
}

.a {
   background: radial-gradient(circle, blue, lightblue, yellow);
}

.p {
    background: radial-gradient(circle, green, lightgreen, yellow);
}

.c {
    background: radial-gradient(circle, red, orange, yellow);
}

.w {
    background-color: whitesmoke;
}