/*初始化111*/ html,body{margin: 0;padding: 0;} .pagebox{ position:relative; }@media only screen and (max-width:768px){ .cateBox {border-radius: 10px; overflow:hidden; background-color:#004c8b; } .backBtn { width: 100%; height: 40px; line-height: 50px;margin:0 auto; text-align: center; } .backBtn>i { font-size: 1.8rem; color: #fff; } }