DEMO

HTML

		<a class="btn-emergency" href="リンク先URL">
  <span class="btn-emergency-bottom"></span>
  <span class="btn-emergency-top"><span>押す</span></span>
</a>
		

HTML説明

リンクの設定方法
リンク先URL(1行目)のテキストを任意のURLに書き換えてください

CSS

		<style>
.btn,
a.btn,
button.btn {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.5;
  position: relative;
  display: inline-block;
  padding: 1rem 4rem;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  text-align: center;
  vertical-align: middle;
  text-decoration: none;
  letter-spacing: 0.1em;
  color: #212529;
  border-radius: 0.5rem;
}
a.btn-emergency {
  position: relative;
  display: block;
  width: 200px;
  height: 130px;
  margin: 0 auto;
}
a.btn-emergency:hover .btn-emergency-top {
  top: 10px;
  height: 50px;
}
a.btn-emergency:active .btn-emergency-top {
  top: 20px;
  height: 40px;
}
.btn-emergency-top {
  position: absolute;
  top: 0;
  left: 20px;
  width: 160px;
  height: 60px;
  margin-top: 30px;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
  border-radius: 0 0 50% 50%;
  background: #d62d2d;
}
.btn-emergency-top:before {
  position: absolute;
  top: -30px;
  left: 0;
  width: 160px;
  height: 60px;
  content: "";
  border-radius: 80px / 30px;
  background: #ed4c4c;
}

.btn-emergency-top span {
  font-size: 38px;
  font-weight: bold;

  position: absolute;
  top: -24px;
  left: 0;
  width: 100%;
  -webkit-transform: scaleY(0.75);
  transform: scaleY(0.75);
  text-align: center;
  color: #f6a3a3;
}
.btn-emergency-bottom {
  position: absolute;
  top: 38px;
  left: 0;
  width: 200px;
  height: 80px;
  border-radius: 100px / 40px;
  background: #d8e4ea;
  -webkit-box-shadow: 0 8px 0 #c4cacc;
  box-shadow: 0 8px 0 #c4cacc;
}
</style>
		

CSS説明

こちらは特に編集する必要はありません。
詳しい方は色やフォントなど自由に編集してご使用ください。