<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Document</title><style> body{ width: 100%; height: 100%; background: green; z-index: 1; }.wrap{width: 100%;height: 100%;position: relative;z-index: 3;background: red;}.top{width: 100px;height: 50px;position: absolute;top: 10%;left: 10%;background: blue;}</style></head><body><div class="wrap"><div class="top"></div><div class="bottom"></div></div></body></html>
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