所以我的注册/登录CSS和我的菜单栏的CSS是水平的。在具有register.css的页面上，菜单栏似乎缩小了。 在没有register.css的页面上，菜单栏很好。 为什么是这样？我需要改变什么？
menu.css
body, div, h1, h2, h3, h4, h5, h6, p, ul, ol, li, dl, dt, dd, img, form, fieldset, input, textarea, blockquote {
margin: 0; padding: 0; border: 0;
}
body {
background: #0ca3d2;
font-family: Helvetica, sans-serif; font-size: 16px; line-height: 24px;
}
nav {
margin: 5px auto;
text-align: center;
}
nav ul ul {
display: none;
}
nav ul li:hover > ul {
display: block;
}
nav ul {
background: #efefef;
background: linear-gradient(top, #efefef 0%, #bbbbbb 100%);
background: -moz-linear-gradient(top, #efefef 0%, #bbbbbb 100%);
background: -webkit-linear-gradient(top, #efefef 0%,#bbbbbb 100%);
box-shadow: 0px 0px 9px rgba(0,0,0,0.15);
border-radius: 10px;
list-style: none;
position: relative;
display: inline-table;
}
nav ul:after {
content: ""; clear: both; display: block;
}
nav ul li {
float: left;
}
nav ul li:hover {
background: #4b545f;
background: linear-gradient(top, #4f5964 0%, #5f6975 40%);
background: -moz-linear-gradient(top, #4f5964 0%, #5f6975 40%);
background: -webkit-linear-gradient(top, #4f5964 0%,#5f6975 40%);
}
nav ul li:hover a {
color: #fff;
}
nav ul li a {
display: block; padding: 10px 30px;
color: #757575; text-decoration: none;
}
nav ul ul {
background: #5f6975; border-radius: 0px; padding: 0;
position: absolute; top: 100%;
}
nav ul ul li {
float: none;
border-top: 1px solid #6b727c;
border-bottom: 1px solid #575f6a; position: relative;
}
nav ul ul li a {
padding: 5px 20px;
color: #fff;
}
nav ul ul li a:hover {
background: #4b545f;
}
nav ul ul ul {
position: absolute; left: 100%; top:0;
}
register.css / login.css
body {
font: 13px/20px 'Lucida Grande', Tahoma, Verdana, sans-serif;
color: #404040;
background: #0ca3d2;
}
.container {
margin: 80px auto;
margin-left: 425px;
margin-top: 90px;
width: 600px;
}
.register {
position:relative;
margin: 20px auto;
padding: 20px 20px 20px;
width: 250px;
background: white;
border-radius: 3px;
box-shadow: 0 0 200px rgba(white, .5), 0 1px 2px rgba(black, .3));
&:before {
content: '';
position: absolute;
top: -8px; right: -8px; bottom: -8px; left: -8px;
z-index: -1;
background: rgba(black, .08);
border-radius: 4px;
}
h1 {
margin: -20px -20px 21px;
line-height: 40px;
font-size: 15px;
font-weight: bold;
color: #555;
text-align: center;
text-shadow: 0 1px white;
background: #f3f3f3;
border-bottom: 1px solid #cfcfcf;
border-radius: 3px 3px 0 0;
linear-gradient:top, whiteffd, #eef2f5;
box-shadow:0 1px #f5f5f5;
}
p { margin: 20px 0 0; }
p:first-child { margin-top: 0; }
input[type=number], input[type=password], input[type=tel], input[type=email], input[type=date], input[type=number] { width: 278px; }
.submit { text-align: center; }
}
:-moz-placeholder {
color: #c9c9c9 !important;
font-size: 13px;
}
::-webkit-input-placeholder {
color: #ccc;
font-size: 13px;
}
input {
font-family: 'Lucida Grande', Tahoma, Verdana, sans-serif;
font-size: 14px;
}
input[type=text], input[type=number], input[type=password], input[type=tel], input[type=email], input[type=date], input[type=number] {
margin: 5px;
padding: 0 10px;
padding-left: 10px;
width: 200px;
height: 34px;
color: #404040;
background: white;
border: 1px solid;
border-color: #c4c4c4 #d1d1d1 #d4d4d4;
border-radius: 2px;
outline: 5px solid #eff4f7;
&:focus {
border-color: #7dc9e2;
outline-color: #dceefc;
outline-offset: 0; // WebKit sets this to -1 by default
}
}
input[type=submit] {
padding: 0 18px;
height: 29px;
font-size: 12px;
font-weight: bold;
color: #527881;
text-shadow: 0 1px #e3f1f1;
background: #cde5ef;
border: 1px solid;
border-color: #b4ccce #b3c0c8 #9eb9c2;
border-radius: 16px;
outline: 0;
@include box-sizing(content-box); // Firefox sets this to border-box by default
@include linear-gradient(top, #edf5f8, #cde5ef);
@include box-shadow(inset 0 1px white, 0 1px 2px rgba(black, .15));
&:active {
background: #cde5ef;
border-color: #9eb9c2 #b3c0c8 #b4ccce;
@include box-shadow(inset 0 0 3px rgba(black, .2));
}
}
.lt-ie9 {
input[type=text], input[type=password] { line-height: 34px; }
}
更新 我已添加以下预览：
相关HTML：
<?php
include("menu_admin.php");
?>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Register User</title>
<link rel="stylesheet" type="text/css" href="register.css">
<!--[if lt IE 9]><script src="//html5shim.googlecode.com/svn/trunk/html5.js"></script><![endif]-->
</head>
<body>
<section class="container">
<div class="register">
<h1>Register Cadet</h1>
<form action="process_register.php" method="POST"/>
<div class="help-tip">
<p>Enter a suitable ID with only numbers. Create a strong password and enter it again</p>
</div>
<br>
<p><input type="number" name="ID" id="ID" placeholder="Cadet_ID*" autofocus required></p>
<br>
<p><input type="password" name="Password" id="Password" placeholder="Password*" required></p>
<br>
<p><input type="password" name="Password_2" id="Password_2" placeholder="Re-enter Password*" required></p>
<br>
<p>
Status*
<select name="Status" id="Status">
<option value="0">User</option>
<required>
</select>
</p>
<br>
<p class="submit"><input type="submit" name="commit" value="Next"></p>
</form>
</body>
</html>