.btn-up:hover{
  box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
    color: yellow;
      -ms-transform: scale(1.5); /* IE 9 */
    -webkit-transform: scale(1.5); /* Safari 3-8 */
    transform: scale(1.1); 
    transition: transform 0.5s ease-in;
  }
  .btn-up{
    margin: 6px 6px 6px 5px;
  }