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【CSS】ボタンの外側に半透明のoutlineをつける

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背景

ボタンの外側に半透明のoutline(外枠)をつける方法がわからなかったため、備忘録的に記載する。

実装結果

スクリーンショット 2024-05-08 22.37.09.png

実装

html
<div class="btn-outside">
  <button class="btn">
    ボタン
  </button>
</div>
css
.btn-outside {
  padding: 4px;
  background-color: rgba(243, 240, 242, 0.1); // 半透明に指定
  width: 352px;
  height: 64px;
  border-radius: 32px;
}

.btn {
  width: 100%;
  height: 100%;
  padding: 16px;
  font-size: 16px;
  background-color: #efefef;
  border-radius: 28px;
}

btn-outside 側にwidthとheightを指定し、btn 側はwidthを100%、heightを100%で指定する。
border-radiusは相対角丸で算出する。
https://coliss.com/articles/build-websites/operation/css/inner-radius-design-tip-with-css.html

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