W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style>
#container {
  position: relative;
  width: 60%;
  aspect-ratio: 3/2;
  margin: auto;
  border: solid black 2px;
}

#leftDiv {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 25px;
  z-index: 1;
  background-color: rgba(0, 0, 0, 0.8);
  color: white;
  writing-mode: vertical-lr;
  text-orientation: upright;
}

#imgDiv {
  position: absolute;
  inset: 0 0 0 0;
  padding-left: 40px;
  overflow-x: scroll;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  white-space: nowrap;
  scroll-padding-left: 30px;
}
      
#imgDiv > img {
  height: 95%;
  margin: 2px;
  scroll-snap-align: none start;
}
</style>
</head>
<body>

<h3>CSS scroll-padding-left property.</h3>
<p>Scroll inside the photo gallery box, stop scrolling, and see the scroll-snap effect with snap position start and scroll-padding-left 30px. The effect of the scroll-padding-left property value is that the images comes out from behind the fixed element on the left.</p>

<div id="container">
  <div id="leftDiv">Fixed</div>
  <div id="imgDiv">
    <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>
</div>

</body>
</html>