a.button {
  background-color: #EFF4FF;
  border: none;
  color: #2557D6;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  margin-right: 13px;
  margin-left: -1px;
  margin-bottom: 10px;
  border-radius: 100px;
  cursor: pointer;
  transition: box-shadow 0.5s ease;
}

a.button:hover {
  box-shadow: inset 0em 0em 0em 10em #DCE6FF;
}