CSS : 

.circles-background {
    background:
        radial-gradient(
            khaki 40px,
            transparent 0,
            transparent 100%
        ),
        radial-gradient(
            skyblue 40px,
            transparent 0,
            transparent 100%
        ),
        radial-gradient(
            pink 40px,
            transparent 0,
            transparent 100%
        ), snow;
    background-blend-mode: multiply;
    background-size: 100px 100px;
    background-position: 0 0, 33px 33px, -33px -33px;
}