CSS:

.case01{border:1px solid #96c2f1;background:#eff7ff}
.case02{border:1px solid #9bdf70;background:#f0fbeb}
.case03{border:1px solid #bbe1f1;background:#eefaff}
.case04{border:1px solid #cceff5;background:#fafcfd}
.case05{border:1px solid #ffcc00;background:#fffff7}
.case06{border:1px solid #cee3e9;background:#f1f7f9}
.case07{border:1px solid #a9c9e2;background:#e8f5fe}
.case08{border:1px solid #e3e197;background:#ffffdd}
.case09{border:1px solid #adcd3c;background:#f2fddb}
.case10{border:1px solid #f8b3d0;background:#fff5fa}
.case11{border:1px solid #d3d3d3;background:#f7f7f7}
.case12{border:1px solid #bfd1eb;background:#f3faff}
.case13{border:1px solid #ffdd99;background:#fff9ed}
.case14{border:1px solid #cacaff;background:#f7f7ff}
.case15{border:1px solid #a5b6c8;background:#eef3f7}

case01 border:1px solid #96c2f1;background:#eff7ff

case02 border:1px solid #9bdf70;background:#f0fbeb

case03 border:1px solid #bbe1f1;background:#eefaff

case04 border:1px solid #cceff5;background:#fafcfd

case05 border:1px solid #ffcc00;background:#fffff7

case06 border:1px solid #cee3e9;background:#f1f7f9

case07 border:1px solid #a9c9e2;background:#e8f5fe

case08 border:1px solid #e3e197;background:#ffffdd

case09 border:1px solid #adcd3c;background:#f2fddb

case10 border:1px solid #f8b3d0;background:#fff5fa

case11 border:1px solid #d3d3d3;background:#f7f7f7

case12 border:1px solid #bfd1eb;background:#f3faff

case13 border:1px solid #ffdd99;background:#fff9ed

case14 border:1px solid #cacaff;background:#f7f7ff

case15 border:1px solid #a5b6c8;background:#eef3f7