.totop{
    background: red;
    width:50px;
    height:50px;
    position:fixed;
    bottom:75px;
    right: 50px;
    z-index:99;
    cursor:pointer;
    border-radius:100px;
    transition:all .5s;
    background:#013843 url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M7.41,15.41L12,10.83L16.59,15.41L18,14L12,8L6,14L7.41,15.41Z' fill='%23fff'/%3E%3C/svg%3E") no-repeat center center;
  }

  .totop:hover{
    background:#1d2129 url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M7.41,15.41L12,10.83L16.59,15.41L18,14L12,8L6,14L7.41,15.41Z' fill='%23fff'/%3E%3C/svg%3E") no-repeat center center;}
  }