编写中文网页，记得把头部语言改为 <html lang="zh-cn"> 而不是<html lang="en">
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="utf-8">
<style type="text/css">
* {
padding: 0;
margin: 0;
}
img {
width: 100%;
display: block;
}
.imgs {
width: 100%;
height: auto;
position: relative;
}
.imgs p {
width: 300px;
height: 100px;
text-align: center;
line-height: 100px;
position: absolute;
left: 50%;
top: 50%;
background: #E46262;
opacity: .3;
margin-left: -150px;
margin-top: -50px;
}
</style>
</head>
<body>
<div class="imgs">
<img src="images/banner.jpg" alt="" title="这是logo">
<p>这里是相对于div定位</p>
</div>
</body>
</html>
相对于上层div定位，效果图.png
总结：
外层div添加：
position: relative;
内层div添加：
position: absolute; left: 50%; top: 50%;