body {
  padding-top: 50px;
  padding-bottom: 20px;
}

footer {
   margin: 50px 0;
   text-align:center;
   font-size:63%;/* 10px相当 */
   font-style:normal;
   padding:15px 0px 5px 0px;
   border-top:1px solid #CECFCE;
}