How Can I Properly Select First and Last Child Elements with CSS?

Addressing CSS Issues in Selecting First and Last Child Elements

When faced with difficulties in selecting the first and last child elements using CSS, it's essential to consider the context of your code. In the provided Fiddle, the .area elements are direct children of the tag. However, to correctly apply the :first-child and :last-child pseudo-classes, it's crucial to ensure that the .area elements are nested within a container.

To address this issue, add a container element around your .area elements. This will provide a proper context in which to identify the first and last child elements based on their position within the container.

Here's a revised version of your code:

.container {
  display: flex;
}

.area {
  height: 100px;
  width: 100px;
}

.area:first-child {
  background-color: red;
}

.area:last-child {
  background-color: green;
}

<div class="container">
  <div class="area">1</div>
  <div class="area">2</div>
  <div class="area">3</div>
  <div class="area">4</div>
</div>

By nesting the .area elements within the .container, you establish a clear hierarchy. The :first-child and :last-child pseudo-classes can now accurately target the first and last child elements of the .container.

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