It should be better to use the bootstrap getting started template. https://getbootstrap.com/docs/4.4/getting-started/introduction/#starter-template
提示：為了避免第二個<div>無法往上捲動，請加入第三個長<div>。
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<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<div id="first" class="container-fluid"></div>
<div id="second" class="container-fluid"></div>
<div style="height:1000px;background-color:black;"></div>
</body>
</html>#first {
background-image: url("assets/123.png");
min-height: 2400px;
background-attachment: fixed;
background-position: center;
background-repeat: no-repeat;
background-size: cover;
}
#second {
background-image: url("assets/123_2.png");
min-height: 1200px;
background-attachment: fixed;
background-position: center;
background-repeat: no-repeat;
background-size: cover;
}