body{
background-color:silver;
background-image:
radial-gradient(circle at 100% 150%, silver 24%, white 25%, white 28%, silver 29%, silver 36%, white 36%, white 40%, transparent 40%, transparent),
radial-gradient(circle at 0 150%, silver 24%, white 25%, white 28%, silver 29%, silver 36%, white 36%, white 40%, transparent 40%, transparent),
radial-gradient(circle at 50% 100%, white 10%, silver 11%, silver 23%, white 24%, white 30%, silver 31%, silver 43%, white 44%, white 50%, silver 51%, silver 63%, white 64%, white 71%, transparent 71%, transparent),
radial-gradient(circle at 100% 50%, white 5%, silver 6%, silver 15%, white 16%, white 20%, silver 21%, silver 30%, white 31%, white 35%, silver 36%, silver 45%, white 46%, white 49%, transparent 50%, transparent),
radial-gradient(circle at 0 50%, white 5%, silver 6%, silver 15%, white 16%, white 20%, silver 21%, silver 30%, white 31%, white 35%, silver 36%, silver 45%, white 46%, white 49%, transparent 50%, transparent);
background-size:100px 50px;
}