HTML：实现圣诞树代码
以下是一个用HTML实现圣诞树的示例代码：
<!DOCTYPE html>
<html>
<head>
<style>
body {
background-color: #333;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
}
.tree {
color: green;
text-align: center;
font-size: 20px;
line-height: 20px;
margin: 0 auto;
}
.tree-top {
color: brown;
font-size: 40px;
line-height: 40px;
margin-bottom: -10px;
}
.tree-body {
height: 300px;
position: relative;
}
.tree-layer {
position: absolute;
left: 0;
right: 0;
bottom: 0;
}
.tree-layer:nth-child(1) {
height: 40px;
background-color: green;
}
.tree-layer:nth-child(2) {
height: 60px;
background-color: limegreen;
margin-bottom: