浏览器调整大小时，下拉菜单不会保持居中

Question

我遇到的问题是 CSS 的格式一旦 windows 调整为更小。我遇到了很多麻烦，并认为问题出在我的初始代码上；我只是不确定在哪里。

我对编码很陌生，希望学习。

.nav-main {
 position: absolute;
 top: 0;
 height: 65px;
 width: 100%;
 text-align: center;
}
.nav-main ul {
 position: relative;
 margin: 0 auto;
 padding: 0;
 list-style: none;
 font-size: 22px;
 line-height: 100%;
 font-family: 'Futura W01 Bold', sans-serif;
 text-align: center;
 text-transform: uppercase;
 display: inline-block;
 width: 100%;
}
.nav-top {
 position: relative;
 margin: 0;
 padding: 0 66px 0 50px;
 float: none;
 display: inline-block;
 list-style: none;
}
.nav-top:first-child {
 padding-left: 0;
}
.nav-top:last-child {
 background-image: none;
 padding-right: 0;
}
.nav-top:last-child:after {
 content: none;
}
.nav-top > a {
 position: relative;
 display: block;
 margin: 0;
 color: #6f6f6f;
 text-decoration: none;
 padding-top: 20px;
 padding-bottom: 5px;
 -moz-transition: all 0.3s ease;
 -ms-transition: all 0.3s ease;
 -o-transition: all 0.3s ease;
 transition: all 0.3s ease;
}
.nav-top a:hover,
.nav-top.active > a {
 color: #454545;
 border-bottom: 4px solid #00e9d9;
 text-decoration: none;
}
.nav-top ul {
  display: block;
  position: absolute;
  left: -8.75px;
  width: 105%;
  top: calc(100% - 1px);
  border-bottom-left-radius: .3em;
  border-bottom-right-radius: .3em;

}
.nav-top:hover ul {
  position: absolute;
  top: calc(100% - 1px);
  left: -8.75px;
  width: 105%;
}
.nav-top li {
  float: center; 
  background-color: #e9e9e9;
  padding-top: 16px;
  padding-bottom: 10px;
  text-align: inherit;
}
.nav-top li:last-child {
 padding-bottom: 16px;
 border-bottom-left-radius: .3em;
    border-bottom-right-radius: .3em;
}
.nav-top li > a {
 position: relative;
 display: inline;
 margin: 0;
 color: #6f6f6f;
 text-decoration: none;
 padding-top: 20px;
 -moz-transition: all 0.3s ease;
 -ms-transition: all 0.3s ease;
 -o-transition: all 0.3s ease;
 transition: all 0.3s ease;

}
.nav-top:after {
 
    display: block;
    position: absolute;
    left: 100%;
    top: -17px;
    width: 22px;
    z-index: 1;
    transform: translateX(-50%);
    height: 100%;
    -ms-transform: translateX(-50%);
    -webkit-transform: translateX(-50%);
}

@media only screen and (max-width:960px) {
 .nav-main ul {
  font-size: 18px;
 }
 .nav-top ul {
  font-size: 15px;
 }
 .nav-main li {
  padding: 0 46px 0 30px; /* 0 66 0 50 */
 }
 .nav-top li {
  padding-top: 11px;
  text-align: center;/* top 16 bottom 10*/
  float: center;
 }

<nav class="nav-main" role="navigation">
  <ul>
    <li class="nav-top"><a href="#welcome">Welcome</a></li>
    <li class="nav-top"><a href="#about">About</a>
      <ul class="drop-down">
        <li class="nav-drop"><a href="#services">Services</a></li>
        <li class="nav-drop"><a href="#client">Clients</a></li>
        <li class="nav-drop"><a href="#press">Press</a></li>
        <li class="nav-drop"><a href="#leadership">Leadership</a></li>
        <li class="nav-drop"><a href="#twitter">Follow Us</a></li>
      </ul>
    </li>
    <li class="nav-top"><a href="#contact">Contact</a></li>
  </ul>     
  <span class="nav-arrow"></span>
</nav>

JSFIDDLEJS fiddle

Answer 1

您在 @media only screen and (max-width:960px) 上的 .nav-main li 正在影响它。

您可以使用 :not 选择器 .nav-main li:not(.nav-drop) 或使用 padding-left: 0; padding-right: 0.

覆盖 .nav-drop

如果您使用其他媒体查询，请不要忘记修改它。

JSFiddle

浏览器调整大小时，下拉菜单不会保持居中

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