<a href="#" class="btn5">ボタンはこちら5</a>
.btn5 {
  display: inline-block;
  padding: 1em;
  text-decoration: none;
  background: #3F51B5;
  color: #FFF;
  border-bottom: solid 4px #25379B;
  transition: all 0.3s ease 0s;
}

.btn5:hover {
  color: #4CAF50;
}
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