How can I customize the height of a scrollbar in CSS?

Customizing Scrollbar Height

In order to modify the height of a scrollbar, it is essential to understand the structural composition of a scrollbar. A scrollbar consists of several elements, including:

• Scrollbar Thumb: Represents the draggable area that users manipulate to scroll.
• Scrollbar Track: The background area where the thumb moves.

To achieve the desired effect shown in the provided image, it is necessary to:

1. Define a starting and ending point for the scrollbar thumb, ensuring that it only scrolls within a specific region.
2. Create a substitute scroll track, replacing the default track.

Here is an example code snippet that demonstrates how to accomplish this:

<code class="css">.wrapper {
  overflow-y: scroll;
  width: 100%;
  height: 100%;

  /* Create a fake scroll track */
  &::after {
    content: '';
    position: absolute;
    width: 5px;
    height: calc(100% - 20px);
    z-index: -1;
    top: 10px;
    background: #666;
    right: -1px;
  }

  /* Customize the scrollbar properties */
  &::-webkit-scrollbar {
    width: 5px;
  }

  &::-webkit-scrollbar-track {
    background: transparent;
  }

  &::-webkit-scrollbar-corner {
    background: transparent;
  }

  &::-webkit-scrollbar-thumb {
    background-color: red;
    border: none;
    border-radius: 5px;
  }

  /* Define the end and start points of the scrollbar thumb */
  &::-webkit-scrollbar-track-piece:end {
    margin-bottom: 10px;
  }

  &::-webkit-scrollbar-track-piece:start {
    margin-top: 10px;
  }
}</code>

This code snippet creates a custom scrollbar with a height of 50%, as specified in the provided image. It does so by adjusting the size of the scrollbar thumb and creating a fake scroll track to replace the original one.

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