代碼按照老師的寫(xiě)的 ??.st-panle{ left: 0; top: 0; background: #fff; overflow: hidden;}.st-desc{ width: 200px; height: 200px; background: red; position: absolute; left: 50%; top: 0; margin-left: -100px; -webkit-transform: translateY(-50%) rotate(45deg); -moz-transform: translateY(-50%) rotate(45deg); -o-transform: translateY(-50%) rotate(45deg); -ms-transform: translateY(-50%) rotate(45deg); transform: translateY(-50%) rotate(45deg);?}? 求大神幫忙看看