.btn_outer
{
    padding: 0;
border: none;
background: none;
}
.btn_outer:hover {
    box-shadow: 0 12px 16px 0 rgba(113, 100, 231, 0.886),0 17px 50px 0 rgba(0,0,0,0.19);
    background:gray;
    font-size:30px;
  }