<a href="/buttons/6" class="bn6">Button</a>

.bn6 {
  cursor: pointer;
  outline: none;
  border: none;
  background-color: #232423;
  padding: 0.3em 1.2em;
  border-radius: 30px;
  font-size: 1.3rem;
  font-weight: 550;
  color: #ffffff;
  background-size: 100% 100%;
  box-shadow: 0 0 0 4px #232423 inset;
}

.bn6:hover {
  background-image: linear-gradient(
    55deg,
    transparent 10%,
    #161616 10% 20%,
    transparent 20% 30%,
    #161616 30% 40%,
    transparent 40% 50%,
    #161616 50% 60%,
    transparent 60% 70%,
    #161616 70% 80%,
    transparent 80% 90%,
    #161616 90% 100%
  );
  animation: background 3s linear infinite;
}