html::after { position: fixed; top: 0; right: 0; left: 0; bottom: 0; content: ''; display: block; background-attachment: fixed; background-size: cover; background-position: center; }
时间: 2024-02-15 08:28:12 浏览: 29
这是一段 CSS 代码,应该是用于实现全屏背景图片的效果。具体来说,它定义了一个伪元素 "::after",并对该元素设置了一些样式,包括固定定位、覆盖整个屏幕、背景图片填充整个元素、背景图片居中等等。这段代码的作用是在 HTML 页面的最上层添加一个全屏背景图片,美化页面的外观。需要注意的是,该样式需要配合一个背景图片的 URL 使用。
相关问题
伪元素before和after用法
伪元素:before和:after是CSS中伪元素的一种,通过它们可以在文档中创建一些不同于常规文本或元素的内容。它们分别表示在元素内容前面和后面插入的虚拟元素。
:before和:after伪元素的使用方法如下:
1. 语法:
```
selector:before {
content: "";
}
selector:after {
content: "";
}
```
2. 属性:
- content:用于定义伪元素的内容,其取值可以是字符串、URL、计数器、属性值等。如果不设置该属性,则伪元素不会显示。
- display:用于定义伪元素的显示方式,如block、inline、inline-block等。
- position:用于定义伪元素的定位方式,如absolute、fixed等。如果设置了该属性,则需要配合top、bottom、left、right属性来定位。
3. 示例:
```
/* 在每个段落前插入一个引号 */
p:before {
content: "“";
}
/* 在每个段落后插入一个引号 */
p:after {
content: "”";
}
```
使用:before和:after伪元素可以为页面的装饰和交互增加很多可能性,如图标、箭头、背景形状等。
web登录注册页面html
好的,以下是一个简单的 web 登录注册页面的 HTML 代码:
```html
<!DOCTYPE html>
<html>
<head>
<title>Login/Register Page</title>
<style type="text/css">
body {
background-color: #f2f2f2;
}
form {
background-color: #ffffff;
border: 1px solid #cccccc;
padding: 20px;
width: 300px;
margin: 0 auto;
margin-top: 100px;
border-radius: 5px;
}
input[type=text], input[type=password] {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
button {
background-color: #4CAF50;
color: white;
padding: 14px 20px;
margin: 8px 0;
border: none;
border-radius: 4px;
cursor: pointer;
width: 100%;
}
button:hover {
background-color: #45a049;
}
.container {
padding: 16px;
background-color: #f2f2f2;
text-align: center;
}
span.psw {
float: right;
padding-top: 16px;
}
/* Modal styles */
.modal {
display: none;
position: fixed;
z-index: 1;
padding-top: 100px;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: rgb(0,0,0);
background-color: rgba(0,0,0,0.4);
}
/* Modal content */
.modal-content {
background-color: #fefefe;
margin: auto;
padding: 20px;
border: 1px solid #888;
width: 50%;
}
/* Close button */
.close {
color: #aaaaaa;
float: right;
font-size: 28px;
font-weight: bold;
}
.close:hover,
.close:focus {
color: #000;
text-decoration: none;
cursor: pointer;
}
.clearfix::after {
content: "";
clear: both;
display: table;
}
/* Float cancel and signup buttons and add an equal width */
.cancelbtn, .signupbtn {
float: left;
width: 50%;
}
/* Add padding to container elements */
.container {
padding: 16px;
}
/* The Modal (background) */
.modal {
display: none;
position: fixed;
z-index: 1;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: rgb(0,0,0);
background-color: rgba(0,0,0,0.4);
}
/* Modal Content/Box */
.modal-content {
background-color: #fefefe;
margin: 5% auto 15% auto;
border: 1px solid #888;
width: 80%;
/* Could be more or less, depending on screen size */
}
/* Style the horizontal ruler */
hr {
border: 1px solid #f1f1f1;
margin-bottom: 25px;
}
/* The Close Button (x) */
.close {
position: absolute;
right: 35px;
top: 15px;
font-size: 40px;
font-weight: bold;
color: #f1f1f1;
}
.close:hover,
.close:focus {
color: #f44336;
cursor: pointer;
}
/* Clear floats */
.clearfix::after {
content: "";
clear: both;
display: table;
}
/* Change styles for cancel button and signup button on extra small screens */
@media screen and (max-width: 300px) {
.cancelbtn, .signupbtn {
width: 100%;
}
}
</style>
</head>
<body>
<!-- Login form -->
<form>
<h2>Login Form</h2>
<label for="username"><b>Username</b></label>
<input type="text" placeholder="Enter Username" name="username" required>
<label for="password"><b>Password</b></label>
<input type="password" placeholder="Enter Password" name="password" required>
<button type="submit">Login</button>
<label>
<input type="checkbox" checked="checked" name="remember"> Remember me
</label>
<div class="container">
<span class="psw"><a href="#">Forgot password?</a></span>
<span class="psw">Don't have an account? <a href="#" onclick="document.getElementById('id01').style.display='block'">Sign up</a></span>
</div>
</form>
<!-- Signup form -->
<div id="id01" class="modal">
<form class="modal-content" action="/action_page.php">
<div class="container">
<h1>Sign Up</h1>
<p>Please fill in this form to create an account.</p>
<hr>
<label for="email"><b>Email</b></label>
<input type="text" placeholder="Enter Email" name="email" required>
<label for="psw"><b>Password</b></label>
<input type="password" placeholder="Enter Password" name="psw" required>
<label for="psw-repeat"><b>Repeat Password</b></label>
<input type="password" placeholder="Repeat Password" name="psw-repeat" required>
<div class="clearfix">
<button type="button" onclick="document.getElementById('id01').style.display='none'" class="cancelbtn">Cancel</button>
<button type="submit" class="signupbtn">Sign Up</button>
</div>
</div>
</form>
</div>
<script type="text/javascript">
// Get the modal
var modal = document.getElementById('id01');
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target == modal) {
modal.style.display = "none";
}
}
</script>
</body>
</html>
```
这段代码会生成一个包含登录和注册功能的页面。可以根据需要进行修改和美化。
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