<div>
  <a href="#" class="btn3">
    ボタンはこちら3
  </a>
</div>
.btn3 {
  display: inline-block;
  padding: 1em;
  text-decoration: none;
  color: #FFF;
  background-image: linear-gradient(#3F51B5 0%, #20295B 100%);
  transition: .4s;
  width: 200px;
  text-align: center;
  border-radius: 3px;
}
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