如何将按钮盒居中？

Question

我有按钮框，应该在导航菜单下居中。由于某种原因，方框没有居中，元素正在浏览导航菜单。

如果您使用dev tools并选择div(按钮框)，您将看到元素的位置。这影响了我的垫子。底部的垫子看上去很好，但在顶部是混乱的。

下面是一个工作示例：

​

section.settingsBox {
  width: 100%;
  padding-top: 0;
  float: left;
  background-color: white;
  border: 2px solid #000099;
}

nav.xNavigationSetting {
  width: 100%;
  margin-left: 0;
  margin-right: 0;
  padding-top: 2px;
  background-color: #c8e2db;
  float: left;
  border-bottom: 2px solid #000099;
  height: 18px;
}

nav.xNavigationSetting a {
  color: black;
  text-decoration: none;
  cursor: pointer;
  font-weight: bold;
  padding-left: 5px;
  padding-right: 5px;
}

nav.xNavigationSetting a:hover {
  color: #999999;
}

div.buttonBox {
  background-color: #c8e2db;
  padding-left: 10px;
  padding-top: 5px;
  padding-bottom: 5px;
  border-bottom: 2px solid #000099;
}

<section class="settingsBox">
  <div id="htmlSetting">
    <nav class="xNavigationSetting">
      <a href="#" data-id="settingMain">Menu</a> |
    </nav>
    <div id="settingTbl">
      <div class="buttonBox">
        <input type="button" name="settingButton" id="settingAdd" value="Add" />
      </div>
      <div class="settingsTblMaster">
        <table>
          <thead>
            <tr>
              <th>Test</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td>Row 1</td>
            </tr>
          </tbody>
        </table>
      </div>
    </div>
  </div>
</section>

​

如果有人能帮我解决这个问题，请告诉我。我非常肯定我的一些CSS属性导致了这个问题。提前谢谢。

Answer 1

这是因为您的.xNavigationSetting类有float: left，删除它将修复这个问题

或者，如果您想保持float: left样式，将clear: left;添加到#settingTbl中

Answer 2

你可以添加

display: flex;
  align-items: center;
  justify-content: center;

转到div.buttonbox

https://jsfiddle.net/207gsm80/

​

section.settingsBox{
	width: 100%;
	padding-top: 0;
	float: left;
	background-color: white;
	border: 2px solid #000099;
}
nav.xNavigationSetting {
	width: 100%;
	margin-left: 0;
	margin-right: 0;
	padding-top: 2px;
	background-color: #c8e2db;
	float: left;
	border-bottom: 2px solid #000099;
	height: 18px;
}
nav.xNavigationSetting a {
	color: black;
	text-decoration: none;
	cursor: pointer;
	font-weight: bold;
	padding-left: 5px;
	padding-right: 5px;
}
nav.xNavigationSetting a:hover {
	color: #999999;
}
div.buttonBox{
	background-color: #c8e2db;
	padding-left: 10px;
	padding-top: 5px;
	padding-bottom: 5px;
	border-bottom: 2px solid #000099;
  display: flex;
  align-items: center;
  justify-content: center;
}

<section class="settingsBox">
	<div id="htmlSetting">
			<nav class="xNavigationSetting">
				<a href="#" data-id="settingMain">Menu</a> |
			</nav>
	<div id="settingTbl">
	<div class="buttonBox">
		<input type="button" name="settingButton" id="settingAdd" value="Add" />
	</div>
	<div class="settingsTblMaster">
	  <table>
    <thead><tr><th>Test</th></tr></thead>
    <tbody><tr><td>Row 1</td></tr></tbody>
    </table>
	</div>
</div>
				</div>
			</section>

​

Answer 3

删除float: left on settingsBox，如果不能删除，则可以将clear: both添加到settingTbl

请参阅下面的示例，该演示清除了使用的float：

​

section.settingsBox {
  width: 100%;
  padding-top: 0;
  float: left;
  background-color: white;
  border: 2px solid #000099;
}

nav.xNavigationSetting {
  width: 100%;
  margin-left: 0;
  margin-right: 0;
  padding-top: 2px;
  background-color: #c8e2db;
  float: left;
  border-bottom: 2px solid #000099;
  height: 18px;
}

nav.xNavigationSetting a {
  color: black;
  text-decoration: none;
  cursor: pointer;
  font-weight: bold;
  padding-left: 5px;
  padding-right: 5px;
}

nav.xNavigationSetting a:hover {
  color: #999999;
}

div.buttonBox {
  background-color: #c8e2db;
  padding-left: 10px;
  padding-top: 5px;
  padding-bottom: 5px;
  border-bottom: 2px solid #000099;
}

#settingTbl {
  clear: both;
}

<section class="settingsBox">
  <div id="htmlSetting">
    <nav class="xNavigationSetting">
      <a href="#" data-id="settingMain">Menu</a> |
    </nav>
    <div id="settingTbl">
      <div class="buttonBox">
        <input type="button" name="settingButton" id="settingAdd" value="Add" />
      </div>
      <div class="settingsTblMaster">
        <table>
          <thead>
            <tr>
              <th>Test</th>
            </tr>
          </thead>
          <tbody>
            <tr>
              <td>Row 1</td>
            </tr>
          </tbody>
        </table>
      </div>
    </div>
  </div>
</section>

​