<body>
<div class="container">
  <a href="#" class="btn_set">サンプルボタン1</a>
</div>
</body>
body {
  width: 90%;
  margin: 0 auto;
}
.container {
  width: 100%;
  background-color: #f3f3f3;
  margin: 2em 0;
  padding: 1em .5em;
  text-align: center;
}
a.btn_set {
  text-decoration: none;
  display: inline-block;
  color: whitesmoke;
  background-color: #575fcf;
  border-radius: 3px;
  font-weight: bold;
  padding: .7em;
  letter-spacing: 1px;
  transition: all .5s ease-in-out 0s;
}
a.btn_set:hover {
  background-color: #ff5e57;
  box-shadow: 0px 3px 6px rgba(0,0,0,.2);
}

External CSS

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External JavaScript

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