情人节的 HTML 代码可以用来创建各种浪漫的效果，比如爱心特效、浪漫背景等。以下是
一些情人节 HTML 代码示例：
1. 创建一个爱心特效：
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>爱心特效</title>
<style>
.heart {
width: 100px;
height: 100px;
position: relative;
transform: rotate(45deg);
background-color: red;
}
.heart::before,
.heart::after {
content: "";
width: 100px;
height: 100px;
background-color: red;
border-radius: 50%;
position: absolute;
}
.heart::before {
top: -50px;
left: 0;
}
.heart::after {
top: 0;
left: 50px;
}
</style>
</head>
<body>
<div class="heart"></div>
</body>
</html>
```
