背景图混合模式 background-blend-mode
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.container {
background: url('1.jpg'), url('2.jpg');
background-size: cover;
background-blend-mode: lighten;
30%;
height:500px;
}
</style>
</head>
<body>
<div class="container"></div>
</body>
</html>