无法强制我的浮动 div 始终在 CSS 的容器内居中（是的，我删除了 float: left）

Question

我在尝试让 CSS 正常工作时遇到了麻烦！我有这个显示面板，每行显示 1-4 个带有 text/image 的单元格。如果我至少有四个电池，它就可以正常工作。但是，如果我需要显示少于 4 个 (display=none)，单元格会向左对齐，我希望它们居中。

据我所知，一张图片在这里说了一千多个字：

这是我目前的 HTML 和 CSS：

HTML:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
    <script src="OEPanel.js"></script>
        <link rel="stylesheet" href="./OEPanel.css">
    <title>Document</title>
</head>

<body>
    <div id="oepanelcontainer" class="OEContainer clearfix">
        <div id="oepanel" class="OEItems clearfix">
            <div id="oecell1" class="OECell"></div>
            <div id="oecell2" class="OECell"></div>
            <div id="oecell3" class="OECell" style="display:none;" ></div>
            <div id="oecell4" class="OECell" style="display:none;" ></div>
        </div>
    </div>
</body>
</html>

CSS:

.OEContainer {
    background-color: beige;
    min-height: 10em;
    vertical-align: middle;
    padding: 10px;
    max-width:1130px;
    margin:auto;
    text-align:center;
    justify-content:space-between;
}

.OEItems {
    min-height: 10em;
    vertical-align: middle;
    padding: 0px;
    max-width:1130px;
    margin:auto;
    text-align:center;
    justify-content:space-between;
}

.clearfix::after { /* clearfix class to expand the element back to its normal height */
    content: '';
    display: block;
    clear: both;
}
  
.OECell {
    background-color: lightblue;
    min-height: 10em;
    vertical-align: middle;
    padding: 0px;
    width:250px;
    text-align:center;
    /* float: left; */
    margin: 5px;
}

@media (max-width: 500px) {
    .OEContainer {
        flex-direction: column;
        align-items: center;
    }
}

感谢您的帮助！谢谢！

重要提示：我意识到直到一定宽度（直到大约 850px）方块会居中，但是当宽度超过这个宽度时方块突然跳到远处离开了。

Answer 1

只需将 display: flex; 和 justify-content: center; 应用于这些项目的直接父项（即 #oepanel ）。无需浮动。

评论后补充：可以在添加 flex-wrap: wrap; 的地方添加媒体查询低于一定宽度的那个规则。（在您自己的媒体查询中完成）

.OEContainer {
  background-color: beige;
  min-height: 10em;
  vertical-align: middle;
  padding: 10px;
  max-width: 1130px;
  margin: auto;
  text-align: center;
  justify-content: space-between;
}

#oepanel {
  display: flex;
  justify-content: center;
}

.OEItems {
  min-height: 10em;
  vertical-align: middle;
  padding: 0px;
  max-width: 1130px;
  margin: auto;
  text-align: center;
  justify-content: space-between;
}

.clearfix::after {
  /* clearfix class to expand the element back to its normal height */
  content: '';
  display: block;
  clear: both;
}

.OECell {
  background-color: lightblue;
  min-height: 10em;
  vertical-align: middle;
  padding: 0px;
  width: 250px;
  text-align: center;
  /* float: left; */
  margin: 5px;
}

@media (max-width: 500px) {
  .OEContainer {
    flex-direction: column;
    align-items: center;
  }
  #oepanel {
    flex-wrap:wrap;
  }
}

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
  <script src="OEPanel.js"></script>
  <link rel="stylesheet" href="./OEPanel.css">
  <title>Document</title>
</head>

<body>
  <div id="oepanelcontainer" class="OEContainer clearfix">
    <div id="oepanel" class="OEItems clearfix">
      <div id="oecell1" class="OECell"></div>
      <div id="oecell2" class="OECell"></div>
      <div id="oecell3" class="OECell" style="display:none;"></div>
      <div id="oecell4" class="OECell" style="display:none;"></div>
    </div>
  </div>
</body>

</html>

无法强制我的浮动 div 始终在 CSS 的容器内居中（是的，我删除了 float: left）

Cannot force my floating divs always to center within container with CSS (yes, I removed float: left)

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