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试图用bootsrtap使16个正方形，这是行不通的，我不知道为什么

• 问答

我正在尝试使用引导程序在我的网站上制作16个正方形，但它不起作用，我不知道为什么。我使用了“ col-xs-3”，但它没有设置宽度，请帮忙。

PS（当然，我可以在CSS中设置宽度，但我不必这么做）

<!DOCTYPE html>
<html>
<head>
  <link rel="icon" href="favicon.png" type="image/x-icon">
  <link rel="stylesheet" href="resources/css/reset.css">
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
  <link rel="stylesheet" href="resources/css/style.css">
  <title>Match Game</title>
</head>
<body>
  <div class="container">
    <div class="row">
      <div class="gameInstructions col-sm-12 col-md-3">
        <h1>Match Game</h1>
        <h2>Rules</h2>
        <p>Click on a card to reveal the number on the other side. Click on a second card to try and find a match to the first. If you succeed,the pair will be removed from play. If not,try again!</p>
        <h2>How To Win</h2>
        <p>You win when all pairs have been found.</p>
      </div>
      <div id="game"class="col-sm-12 col-md-9">
        <div class="row">
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
          <div class="col-xs-3 card"></div>
        </div>
      </div>
    </div>
  </div>
  <script
    src="https://code.jquery.com/jquery-3.1.1.min.js"
    integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8="
    crossorigin="anonymous"></script>
  <script type="text/javascript" src="./resources/js/match-game.js"></script>
  <script type="text/javascript" src="./resources/js/tests.js"></script>
</body>
</html>

/*"Work Sans" Font*/
@font-face {
  font-family: 'Work Sans';
  font-style: normal;
  font-weight: 400;
  src: local('Work Sans'),local('WorkSans-Regular'),url(https://fonts.gstatic.com/s/worksans/v5/QGYsz_wNahGAdqq43Rh_fKDp.woff2) format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}

@font-face {
  font-family: 'Work Sans';
  font-style: normal;
  font-weight: 700;
  src: local('Work Sans Bold'),local('WorkSans-Bold'),url(https://fonts.gstatic.com/s/worksans/v5/QGYpz_wNahGAdqq43Rh3x4X8mNhN.woff2) format('woff2');
  unicode-range: U+0000-00FF,U+FFFD;
}

@font-face {
  font-family: 'Work Sans';
  font-style: normal;
  font-weight: 900;
  src: local('Work Sans Black'),local('WorkSans-Black'),url(https://fonts.gstatic.com/s/worksans/v5/QGYpz_wNahGAdqq43Rh3_4f8mNhN.woff2) format('woff2');
  unicode-range: U+0000-00FF,U+FFFD;
}

/*Universal Styling*/
html{
  font-size: 14px;
}

body{
  font-family: "Work Sans",sans-serif;
  background-color: rgb(255,242,242);
  padding-top: 5.25rem;
}

p{
  color: rgb(74,74,74);
}

h1{
  font-weight: bold;
  font-size: 2.5rem;
  color: rgb(32,64,86);
}

h2{
  font-weight: bold;
  font-size: 1rem;
}

/*Specified Styling*/
.card{
  height: 12.5rem;
  background-color: rgb(153,153,153);
  border: 4px solid #fff;
  border-radius: 8px;
}

预期输出为16个正方形，每个正方形的宽度为25％，高度为12.5rem

luzz111 回答：试图用bootsrtap使16个正方形，这是行不通的，我不知道为什么

这是因为您没有在column中写任何文本。我只在其中写一些文本，然后将显示各列。看到这里我在这里生成了jsfiddle。

,

如果扩展输出为16个框，则为 card 类提供一定的宽度。

.card{
    height: 12.5rem;
    width: 30px;
    background-color: rgb(153,153,153);
    border: 1px solid black;
    border-radius: 8px;
}
,

如果您希望一行中的十六个框具有相同的宽度，请在calc中提供宽度：

.card{
  width: calc(100% / 16)
  height: 12.5rem;
  background-color: rgb(153,153);
  border: 4px solid #fff;
  border-radius: 8px;
}
,

-xs-中缀在Bootstrap 4中不再使用

这是所有设备宽度上的16个卡盒... 

<div class="row">
  <div class="col-3"><div class="card">1</div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">.. </div></div>
  <div class="col-3"><div class="card">16 </div></div>
</div>

Bootstrap columns stacking vertically on mobile device

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