ピョンとジャンプするボタン

<div class="push-button_box">
  <a href="#" class="push-button jump">ジャンプ！</a>
</div>

.push-button_box {
  width: 30%;
  margin: 50px auto;
}

.push-button.jump {
  display: block;
  width: 100%;
  padding: 14px 0;
  background: #a78bfa;
  color: #fff;
  font-size: 16px;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
  border-radius: 12px;
  box-shadow: 0 4px 0 #7c3aed;
  transition: transform 0.15s ease-in-out;
}

.push-button.jump:hover {
  animation: jump-pop 0.4s ease;
}

@keyframes jump-pop {
  0%   { transform: translateY(0); }
  40%  { transform: translateY(-8px); }
  70%  { transform: translateY(4px); }
  100% { transform: translateY(0); }
}