.footer{
    width: 100%;
    height: 140px;
    background: #212121;
 }
 .footer-nav{
     width: 1200px;
     margin: 0 auto;
     height: 100%;
     flex-direction: column;
     font-size: 12px;
     font-weight: 400;
     color: #999999;
     text-align: center;
 }