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，当Windows调整为较小时，CSS的格式化。我遇到了很多麻烦，并认为问题在于我的初始代码;我只是不确定在哪里。

我对编码很新，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>

的jsfiddle JS fiddle

Answer 1

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

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

如果您使用其他媒体查询，请不要忘记修改它。

JSFiddle