How to achieve outstanding effect in the middle of the progress bar through CSS?

Techniques for realizing the highlighting effect in the middle of the CSS progress bar

In front-end development, you often encounter the need to create visual highlights in the middle of the progress bar. This article will introduce a concise way to achieve this effect using CSS.

The following figure shows the target effect: a progress bar with a middle protrusion.

To achieve this effect, we can cleverly use CSS pseudo-elements and linear gradients. The specific methods are as follows:

 .progress-bar {
  position: relative; /* Key: Allow absolute positioning of pseudo-elements*/
}

.progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  right: 50%; /* or left: 50%, adjust the position as needed*/
  height: 100%;
  width: 1rem; /* Adjust the width of the protruding part*/
  background: linear-gradient(to right, rgba(255,255,255,0), rgba(255,255,255,1), rgba(255,255,255,0)); /* Transparent-white-transparent gradient*/
  transform: translateX(0.5rem); /* Fine-tune the position to center the protruding part*/
}

Code explanation:

• .progress-bar : Set position: relative so that the pseudo-element ::after can be positioned absolutely based on it.
• .progress-bar::after : Create a pseudo-element that is overwritten on the progress bar.
  • content: '' : Set to empty content.
  • position: absolute : Use absolute positioning.
  • top: 0 , right: 50% : Position the pseudo-element in the middle of the right side of the progress bar. You can also use left: 50% to position it in the middle of the left and adjust it according to the design.
  • width: 1rem : Sets the width of the projection and can be adjusted as needed.
  • background: linear-gradient(...) : Use linear gradients to create a transition effect from transparent to white to transparent to achieve a sense of prominence. The rgba function allows control of transparency.
  • transform: translateX(0.5rem) : Fine-tune the position to ensure that the protruding part is accurately centered. This value needs to be adjusted according to width .

This method is simple and efficient, and only requires a small amount of CSS code to achieve the desired effect. Remember to adjust parameters, such as the values ​​of width and right or left attributes, based on actual progress bar style and design requirements.

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