CodePen Embed - [CSS] submit ボタン(クリックでへこむ)

<form>
  <p><input type="text"></p>
  <p><input class="click-down" type="submit" value="送信する"></p>
</form>

.click-down {
  transition: 0.2s;
}

.click-down:active {
  transform: translateY(2px);
}

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