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<!DOCTYPE html>
<html>
<head>
<style>
#container {
  width: 50%;
  aspect-ratio: 2/3;
  margin: auto;
  border: solid black 2px;
  overflow-x: hidden;
  overflow-y: scroll;
  scroll-snap-type: y mandatory;
}
      
#container > img {
  width: 100%;
  margin: 2px;
  scroll-snap-align: start;
  scroll-margin-top: 30px;
}
</style>
</head>
<body>
<h3>CSS scroll-margin-top property.</h3>
<p>Drag the scrollbar vertically inside the photo gallery box, let go, and see the scroll-snap effect with snap position start and scroll-margin-top 30px.</p>
<div id="container">
  <img src="img_chania.jpg" alt="alley" width="460" height="345">
  <img src="img_forest_narrow.jpg" alt="bridge in jungle" width="326" height="400">
  <img src="img_mountains.jpg" alt="mountains" width="600" height="400">
  <img src="img_man_narrow.jpg" alt="man with camera" width="709" height="963">
  <img src="img_5terre.jpg" alt="Cinque Terre" width="600" height="400">
</div>
</body>
</html>