.body{height:calc(100vh - 176px);display:flex;justify-content:center}.b_box{width:50%;background-color:#f0f8ff;margin-top:20px;margin-bottom:20px;border-radius:10px}.a_box{font-size:20px;display:flex;margin-left:10px;margin-right:10px;margin-top:5px;justify-content:space-between}