<h2>通常のボタン</h2>
<input type="submit" value="iOS Styled Button!" />

<h2>装飾をリセットしたボタン</h2>
<input class="flat-btn" type="submit" value="No More Style! Button!" />
input[type="submit"] {
  font-size: 20px;
  background: pink;
  border: none;
  padding: 10px 20px;
}
.flat-btn {
  -webkit-appearance: none;
  border-radius: 0;
}

h2 {
  margin: 25px 0 10px;
  font-size: 20px;
}

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