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Flexboxでborderの重なりが気になる場合

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結果だけ先に書くと

.flex-item {
  /* border: 1px solid black; */
  box-shadow : 0 0 0 1px black;
}

border: 1px solid black; だと下みたいに、borderが重なる時に太くなっちゃう。
 2019-09-07 11.20.07.png

box-shadow : 0 0 0 1px black; だと内側に影として枠線をつけるので、重ならない!
 2019-09-07 11.22.29.png

参考

<div id="flex-container">
  <div class="flex-item">flexアイテム1</div>
  <div class="flex-item">flexアイテム2</div>
  <div class="flex-item">flexアイテム3</div>
</div>
#flex-container {
  display: flex;
  width: 600px;
}
.flex-item {
  width: 200px;
  padding: 10px;
  text-align: center;
  /* border: 1px solid black; */
  /* ↓↓↓ */
  box-shadow : 0 0 0 1px black;
  background-color: gray;
}

 2019-09-07 11.22.29.png

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