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css - 如何使用 flexbox 使列表项居中？

问题描述

我正在尝试创建一个导航栏，标题在左侧，列表项居中。我使用 flexbox 来水平排列链接。然后我添加margin: auto到 ul 将它们向左移动但没有对称地居中它们。我猜 ul 已经没有空间移动了。我检查了其他类似的帖子，但无法完全弄清楚问题所在。感谢您的时间。

HTML

* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

body {
    font-family: 'Open Sans', sans-serif;
    background: #fff;
    color: #333;
    line-height: 1.6;
    background: url('/img/showcase.jpg.jpg');
}


#navbar  {
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 1;
    top: 0;
    width: 100%;
    height: 60px;
    background-color: rgba(10, 10, 10, 0.5);
}

#navbar ul {
    display: flex;
    justify-content: space-around;
    text-align: center;
    margin: 0 auto;
    padding: 0;
}

#navbar li {
    list-style: none;
    padding: 20px;
}
<nav id="navbar">
        <div class="logo">
            <h1>Welcome</h1>
        </div>
        <ul>
            <li><a href="#">Home</a></li>
            <li><a href="#">Home</a></li>
            <li><a href="#">Home</a></li>
            <li><a href="#">Home</a></li>
        </ul>
    </nav>

标签： cssflexboxcss-positionnavbarcentering

解决方案

你可以 margin: 0 auto;从#navbar ul

#navbar父容器 ( )上的 flexbox已经将ul. 添加margin: 0 autoflexbox 后添加它会破坏布局。

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
body {
  font-family: 'Open Sans', sans-serif;
  background: #fff;
  color: #333;
  line-height: 1.6;
  background: url('/img/showcase.jpg.jpg');
}
#navbar {
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
  top: 0;
  width: 100%;
  height: 60px;
  background-color: rgba(10, 10, 10, 0.5);
}
#navbar ul {
  display: flex;
  justify-content: space-around;
  text-align: center;
  /* margin: 0 auto; REMOVE THIS LINE */
  padding: 0;
}
#navbar li {
  list-style: none;
  padding: 20px;
}
<nav id="navbar">
  <div class="logo">
    <h1>Welcome</h1>
  </div>
  <ul>
    <li><a href="#">Home</a></li>
    <li><a href="#">Home</a></li>
    <li><a href="#">Home</a></li>
    <li><a href="#">Home</a></li>
  </ul>
</nav>

此外，将您的徽标包含在列表项中可能会产生更好的结果：

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
body {
  font-family: 'Open Sans', sans-serif;
  background: #fff;
  color: #333;
  line-height: 1.6;
  background: url('/img/showcase.jpg.jpg');
}
#navbar, li { /* added flex to li's so content stays vertically centered */
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
  top: 0;
  width: 100%;
  height: 60px;
  background-color: rgba(10, 10, 10, 0.5);
}
#navbar ul {
  display: flex;
  justify-content: space-around;
  text-align: center;
  /* margin: 0 auto; REMOVE THIS LINE */
  padding: 0;
}
#navbar li {
  list-style: none;
  padding: 0 20px; /* fixed vertical padding to 0 from 20px */
  background-color: transparent; /* Added for continuity with your design */
}
<nav id="navbar">
  <ul>
    <li>
      <div class='logo'>
        <h1>Welcome</h1>
      </div>
    </li>
    <li><a href="#">Home</a></li>
    <li><a href="#">Home</a></li>
    <li><a href="#">Home</a></li>
    <li><a href="#">Home</a></li>
  </ul>
</nav>

如果您想在徽标和列表项之间添加空格，您可以添加margin-right: ( n )到徽标本身。见下文：

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
body {
  font-family: 'Open Sans', sans-serif;
  background: #fff;
  color: #333;
  line-height: 1.6;
  background: url('/img/showcase.jpg.jpg');
}
#navbar, li { /* added flex to li's so content stays vertically centered */
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
  top: 0;
  width: 100%;
  height: 60px;
  background-color: rgba(10, 10, 10, 0.5);
}
#navbar ul {
  display: flex;
  justify-content: space-around;
  text-align: center;
  /* margin: 0 auto; REMOVE THIS LINE */
  padding: 0;
}
#navbar li {
  list-style: none;
  padding: 0 20px; /* fixed vertical padding to 0 from 20px */
  background-color: transparent; /* Added for continuity with your design */
}
.logo { /* Added space between logo and list items */
  margin-right: 5rem; /* you can add units in pixels as well if you would like */
}
<nav id="navbar">
  <ul>
    <li>
      <div class='logo'>
        <h1>Welcome</h1>
      </div>
    </li>
    <li><a href="#">Home</a></li>
    <li><a href="#">Home</a></li>
    <li><a href="#">Home</a></li>
    <li><a href="#">Home</a></li>
  </ul>
</nav>

请注意，无论您为所有内容添加多少或多少边距，.logo都会自动保持居中。

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