<a href="/" class="bn3637 bn38">Hover</a>

.bn3637 {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 2rem;
  font-weight: 700;
  font-size: 18px;
  text-align: center;
  text-decoration: none;
  color: #fff;
  backface-visibility: hidden;
  border: 0.3rem solid transparent;
  border-radius: 3rem;
}
.bn38 {
  border-color: transparent;
  transition: background-color 0.3s ease-in-out;
}
  
.bn38:hover {
  background-color: #60605e;
}