Question

如何设置居中对齐菜单，我尝试更改div，ul和li无效的属性：http://codepen.io/anon/pen/dGqdYq

<div id='cssmenu'>
  <ul>    
    <li><a href='#'>Home</a></li>    
    <li class='active has-sub'><a href='#'>Products</a>
      <ul>
        <li class='has-sub'><a href='#'>Product 1</a>
          <ul>
            <li><a href='#'>Sub Product</a></li>
            <li><a href='#'>Sub Product</a></li>
          </ul>
        </li>
        <li class='has-sub'><a href='#'>Product 2</a>
          <ul>
            <li><a href='#'>Sub Product</a></li>
            <li><a href='#'>Sub Product</a></li>
          </ul>
        </li>
      </ul>    
    </li>    
    <li><a href='#'>About</a></li>    
    <li><a href='#'>Contact</a></li> 
  </ul> 
</div>

Answer 1

使用风格可以帮助你

#cssmenu > ul > li
{
float:none;
display:inline-block;
}
#cssmenu
{
margin: 0px auto;
text-align: center;
}

Answer 2

这样做

＆＃13;

@import url(http://fonts.googleapis.com/css?family=Open+Sans);
#cssmenu,
#cssmenu ul,
#cssmenu ul li,
#cssmenu ul li a,
#cssmenu #menu-button {
  margin: 0;
  padding: 0;
  border: 0;
  list-style: none;
  line-height: 1;
  display: block;
  position: relative;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
#cssmenu:after,
#cssmenu > ul:after {
  content: ".";
  display: block;
  clear: both;
  visibility: hidden;
  line-height: 0;
  height: 0;
}
#cssmenu #menu-button {
  display: none;
}
#cssmenu {
  width: 400px;
  font-family: 'Open Sans', sans-serif;
  line-height: 1;
  background: #ffffff;
  margin: auto;
}
#menu-line {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  background: #009ae1;
  -webkit-transition: all 0.25s ease-out;
  -moz-transition: all 0.25s ease-out;
  -ms-transition: all 0.25s ease-out;
  -o-transition: all 0.25s ease-out;
  transition: all 0.25s ease-out;
}
#cssmenu > ul > li {
  float: left;
}
#cssmenu.align-center > ul {
  font-size: 0;
  text-align: center;
}
#cssmenu.align-center > ul > li {
  display: inline-block;
  float: none;
}
#cssmenu.align-center ul ul {
  text-align: left;
}
#cssmenu.align-right > ul > li {
  float: right;
}
#cssmenu.align-right ul ul {
  text-align: right;
}
#cssmenu > ul > li > a {
  padding: 20px;
  font-size: 12px;
  text-decoration: none;
  text-transform: uppercase;
  color: #000000;
  -webkit-transition: color .2s ease;
  -moz-transition: color .2s ease;
  -ms-transition: color .2s ease;
  -o-transition: color .2s ease;
  transition: color .2s ease;
}
#cssmenu > ul > li:hover > a,
#cssmenu > ul > li.active > a {
  color: #009ae1;
}
#cssmenu > ul > li.has-sub > a {
  padding-right: 25px;
}
#cssmenu > ul > li.has-sub > a::after {
  position: absolute;
  top: 21px;
  right: 10px;
  width: 4px;
  height: 4px;
  border-bottom: 1px solid #000000;
  border-right: 1px solid #000000;
  content: "";
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  -o-transform: rotate(45deg);
  transform: rotate(45deg);
  -webkit-transition: border-color 0.2s ease;
  -moz-transition: border-color 0.2s ease;
  -ms-transition: border-color 0.2s ease;
  -o-transition: border-color 0.2s ease;
  transition: border-color 0.2s ease;
}
#cssmenu > ul > li.has-sub:hover > a::after {
  border-color: #009ae1;
}
#cssmenu ul ul {
  position: absolute;
  left: -9999px;
}
#cssmenu li:hover > ul {
  left: auto;
}
#cssmenu.align-right li:hover > ul {
  right: 0;
}
#cssmenu ul ul ul {
  margin-left: 100%;
  top: 0;
}
#cssmenu.align-right ul ul ul {
  margin-left: 0;
  margin-right: 100%;
}
#cssmenu ul ul li {
  height: 0;
  -webkit-transition: height .2s ease;
  -moz-transition: height .2s ease;
  -ms-transition: height .2s ease;
  -o-transition: height .2s ease;
  transition: height .2s ease;
}
#cssmenu ul li:hover > ul > li {
  height: 32px;
}
#cssmenu ul ul li a {
  padding: 10px 20px;
  width: 160px;
  font-size: 12px;
  background: #333333;
  text-decoration: none;
  color: #dddddd;
  -webkit-transition: color .2s ease;
  -moz-transition: color .2s ease;
  -ms-transition: color .2s ease;
  -o-transition: color .2s ease;
  transition: color .2s ease;
}
#cssmenu ul ul li:hover > a,
#cssmenu ul ul li a:hover {
  color: #ffffff;
}
#cssmenu ul ul li.has-sub > a::after {
  position: absolute;
  top: 13px;
  right: 10px;
  width: 4px;
  height: 4px;
  border-bottom: 1px solid #dddddd;
  border-right: 1px solid #dddddd;
  content: "";
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);
  -webkit-transition: border-color 0.2s ease;
  -moz-transition: border-color 0.2s ease;
  -ms-transition: border-color 0.2s ease;
  -o-transition: border-color 0.2s ease;
  transition: border-color 0.2s ease;
}
#cssmenu.align-right ul ul li.has-sub > a::after {
  right: auto;
  left: 10px;
  border-bottom: 0;
  border-right: 0;
  border-top: 1px solid #dddddd;
  border-left: 1px solid #dddddd;
}
#cssmenu ul ul li.has-sub:hover > a::after {
  border-color: #ffffff;
}
@media all and (max-width: 768px), only screen and (-webkit-min-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (min--moz-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (-o-min-device-pixel-ratio: 2/1) and (max-width: 1024px), only screen and (min-device-pixel-ratio: 2) and (max-width: 1024px), only screen and (min-resolution: 192dpi) and (max-width: 1024px), only screen and (min-resolution: 2dppx) and (max-width: 1024px) {
  #cssmenu {
    width: 100%;
  }
  #cssmenu ul {
    width: 100%;
    display: none;
  }
  #cssmenu.align-center > ul,
  #cssmenu.align-right ul ul {
    text-align: left;
  }
  #cssmenu ul li,
  #cssmenu ul ul li,
  #cssmenu ul li:hover > ul > li {
    width: 100%;
    height: auto;
    border-top: 1px solid rgba(120, 120, 120, 0.15);
  }
  #cssmenu ul li a,
  #cssmenu ul ul li a {
    width: 100%;
  }
  #cssmenu > ul > li,
  #cssmenu.align-center > ul > li,
  #cssmenu.align-right > ul > li {
    float: none;
    display: block;
  }
  #cssmenu ul ul li a {
    padding: 20px 20px 20px 30px;
    font-size: 12px;
    color: #000000;
    background: none;
  }
  #cssmenu ul ul li:hover > a,
  #cssmenu ul ul li a:hover {
    color: #000000;
  }
  #cssmenu ul ul ul li a {
    padding-left: 40px;
  }
  #cssmenu ul ul,
  #cssmenu ul ul ul {
    position: relative;
    left: 0;
    right: auto;
    width: 100%;
    margin: 0;
  }
  #cssmenu > ul > li.has-sub > a::after,
  #cssmenu ul ul li.has-sub > a::after {
    display: none;
  }
  #menu-line {
    display: none;
  }
  #cssmenu #menu-button {
    display: block;
    padding: 20px;
    color: #000000;
    cursor: pointer;
    font-size: 12px;
    text-transform: uppercase;
  }
  #cssmenu #menu-button::after {
    content: '';
    position: absolute;
    top: 20px;
    right: 20px;
    display: block;
    width: 15px;
    height: 2px;
    background: #000000;
  }
  #cssmenu #menu-button::before {
    content: '';
    position: absolute;
    top: 25px;
    right: 20px;
    display: block;
    width: 15px;
    height: 3px;
    border-top: 2px solid #000000;
    border-bottom: 2px solid #000000;
  }
  #cssmenu .submenu-button {
    position: absolute;
    z-index: 10;
    right: 0;
    top: 0;
    display: block;
    border-left: 1px solid rgba(120, 120, 120, 0.15);
    height: 52px;
    width: 52px;
    cursor: pointer;
  }
  #cssmenu .submenu-button::after {
    content: '';
    position: absolute;
    top: 21px;
    left: 26px;
    display: block;
    width: 1px;
    height: 11px;
    background: #000000;
    z-index: 99;
  }
  #cssmenu .submenu-button::before {
    content: '';
    position: absolute;
    left: 21px;
    top: 26px;
    display: block;
    width: 11px;
    height: 1px;
    background: #000000;
    z-index: 99;
  }
  #cssmenu .submenu-button.submenu-opened:after {
    display: none;
  }
}

＆＃13;

<!doctype html>
<html lang=''>
<head>
   <meta charset='utf-8'>
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <link rel="stylesheet" href="styles.css">
   <title>CSS MenuMaker</title>
</head>
<body>

<div id='cssmenu'>
<ul>
   <li><a href='#'>Home</a></li>
   <li class='active has-sub'><a href='#'>Products</a>
      <ul>
         <li class='has-sub'><a href='#'>Product 1</a>
            <ul>
               <li><a href='#'>Sub Product</a></li>
               <li><a href='#'>Sub Product</a></li>
            </ul>
         </li>
         <li class='has-sub'><a href='#'>Product 2</a>
            <ul>
               <li><a href='#'>Sub Product</a></li>
               <li><a href='#'>Sub Product</a></li>
            </ul>
         </li>
      </ul>
   </li>
   <li><a href='#'>About</a></li>
   <li><a href='#'>Contact</a></li>
</ul>
</div>

</body>
<html>

＆＃13;

Answer 3

我会使用flexbox，这样你就不需要在菜单上设置一个宽度......

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

中心对齐菜单

3 个答案: