50%;
  background: linear-gradient(
    to right,
    rgb(59, 59, 184),
    rgb(163, 65, 65),
    rgb(172, 26, 26)
  );
  left: -15px;
  bottom: 0;
  transform: translateY(50%);
  transition: 0.5s;
  z-index: -1;
}
.button:hover:before {
  width: 170px;
  height: 170px;
}

</style>
    