CSS scroll-padding-left Property

This property defines the offset for the left side of the scrollport, determining where the content stops when snapped into place.

selector { scroll-padding-left: value; }
auto The browser determines the offset, which is usually 0px unless specified by the user agent.
<length> Specifies a fixed distance from the left edge using units like px, em, or rem.
<percentage> Specifies the offset as a percentage of the scroll container's width.

Code Examples

A basic horizontal scroll gallery where each item snaps 30 pixels away from the left edge of the container.

<style>
.gallery {
  width: 300px;
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-padding-left: 30px;
  border: 2px solid #333333;
}
.item {
  flex: 0 0 200px;
  height: 150px;
  margin-right: 10px;
  background: #0066ff;
  scroll-snap-align: start;
}
</style>
<div class="gallery">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>

An advanced implementation using JavaScript to dynamically adjust the scroll padding, giving the user a wider gutter on the left when requested.

<style>
#scroller {
  width: 100%;
  display: flex;
  overflow-x: scroll;
  scroll-snap-type: x mandatory;
  scroll-padding-left: 0px;
  transition: scroll-padding-left 0.3s ease;
}
.box {
  flex: 0 0 80%;
  height: 200px;
  background: #ff6600;
  scroll-snap-align: start;
  margin: 5px;
}
</style>
<div id="scroller">
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
</div>
<button onclick="adjustPadding()">Add Buffer</button>
<script>
function adjustPadding() {
  const s = document.getElementById("scroller");
  s.style.scrollPaddingLeft = "50px";
}
</script>

Pro Tip

If you have a sticky navigation bar on the left side of a container, set scroll-padding-left to the width of that navigation bar. This prevents the snapped content from being hidden underneath the sticky element, ensuring a professional and polished user experience without needing complex JavaScript calculations.

Deep Dive

Think of scroll-padding-left as a safety buffer for your scroll container. When you implement scroll snapping, the browser tries to align a child element exactly with the edge of the parent. Without this property, your content might get smashed right against the left wall of the container. By setting this on the parent container, you are telling the browser, "Hey, when you snap a child to the left, keep it this many pixels away from the edge." This is purely about the scroll snap area and does not affect the actual layout or box model padding of the container. It effectively shifts the "viewing window" that the snapping logic uses to calculate alignment.

Best Practices

Use this property on the scroll container, not the individual items. It is most effective when you have a horizontal scroll gallery and you want the first part of the next item to be visible, or when you have a fixed sidebar that overlaps part of the scroll area. Always use relative units like rem if you want the padding to scale with the user's font settings, ensuring the UI stays consistent regardless of their device setup.

Common Pitfalls

The most common mistake is applying this to the child elements instead of the parent scroll container; for children, you should use scroll-margin-left instead. Also, remember that this property does absolutely nothing if you haven't defined scroll-snap-type on the container and scroll-snap-align on the children. It is a support property for the snapping system, not a general layout tool.

Accessibility

Setting proper scroll padding ensures that focused elements or snapped content are not partially hidden under floating UI elements or the container's edge. This helps users who rely on keyboard navigation or screen readers to clearly see where the focus has landed within a scrollable list.

Dev Data Table: scroll-padding-left property

default auto
animatable yes
inherited no
experimental no
year_intro 2018
year_standard 2019
js_syntax_1 element.style.scrollPaddingLeft = "20px";
js_syntax_2 element.setProperty("scroll-padding-left", "20px");
js_note When using JavaScript to manipulate this property, remember to use camelCase for the style object property name.
browsers { "Chrome": 69, "Edge": 79, "Firefox": 68, "Safari": 11, "Opera": 56, "Chrome Android": 69, "Safari on iOS": 11, "Samsung Internet": 10.1, "Opera Mobile": 48 }
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