CSS scroll-padding-inline-start Property - Playground Example

<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#container {
  width: 60%;
  aspect-ratio: 3/2;
  padding: 0 40px;
  margin: auto;
  border: solid black 2px;
  overflow-x: scroll;
  overflow-y: hidden;
  white-space: nowrap;
  scroll-snap-type: x mandatory;
  scroll-padding-inline-start: 20px;
}

.blue {
  background-color: lightblue;
  height: 95%;
  aspect-ratio: 5/3;
}

.green {
  background-color: lightgreen;
  height: 80%;
  aspect-ratio: 5/4;
}

.blue, .green {
  display: inline-block;
  margin: 2px;
  scroll-snap-align: none start;
}
</style>
</head>
<body>
<div id="container">
  <div class="blue"></div>
  <div class="green"></div>
  <div class="blue"></div>
  <div class="green"></div>
  <div class="blue"></div>
  <div class="green"></div>
  <div class="blue"></div>
</div>
</body>
</html>