How to Create an Overlay Border Effect Using CSS Pseudo Elements?

Overlaying Borders onto Child Divs with CSS

In the realm of web design, creating visual balance and depth is crucial. One effective technique is to overlay borders onto child divs, transforming simple elements into visually appealing components.

In this case, we aim to mimic the aesthetic shown in the images: a border elegantly overlaid onto content, creating a subtle yet impactful effect. While the initial attempt to use z-index proved unsuccessful, there's a more efficient solution using CSS pseudo elements.

Introducing the CSS pseudo element :before! This powerful tool allows you to create a virtual element within an existing element, without the need for additional HTML markup. By positioning and styling :before, we can effortlessly achieve the desired border overlay effect.

Consider the following code:

body {
  background:grey;
}

.button {
  background: #94c120;
  width: 200px;
  height: 50px;
  margin: 50px;
  position: relative;
}

.button:before {
  content: "";
  position: absolute;
  top: -15px;
  left: -15px;
  width: 100%;
  height: 100%;
  border: 5px solid #fff;
  box-sizing: border-box;
}

By employing :before as a pseudo element within the .button class, we can create a seamless border that effortlessly overlays the content. This technique provides exceptional control over the border's position and size, allowing for precise customization.

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