【css】
background-image:
radial-gradient(#fff 30%,transparent 0),
radial-gradient(#fde 30%,#fbd 0);
background-position:0 0,8px 8px;
background-size:16px 16px;
background-image:
radial-gradient(#fff 30%,transparent 0),
radial-gradient(#feb 30%,#fd6 0);
background-position:0 0,8px 8px;
background-size:16px 16px;
background-image:
radial-gradient(#fff 30%,transparent 0),
radial-gradient(#dfb 30%,#ce7 0);
background-position:0 0,8px 8px;
background-size:16px 16px;
background-image:
radial-gradient(#fff 30%,transparent 0),
radial-gradient(#def 30%,#bdf 0);
background-position:0 0,8px 8px;
background-size:16px 16px;
background-image:
radial-gradient(#fff 30%,transparent 0),
radial-gradient(#edf 30%,#cbf 0);
background-position:0 0,8px 8px;
background-size:16px 16px;