Understanding Margin-Top Issue

In CSS, adding a top margin to the first child element can sometimes push the containing div down. This occurs because the browser automatically collapses adjacent margin values in vertical directions.

Solution: Overflow:auto

To resolve this issue, one effective solution is to add the property overflow: auto to the parent div. This forces the parent container to automatically adjust its height to accommodate the margin without affecting the position of siblings.

Example:

div#header {
  width: 100%;
  background-color: #eee;
  position: relative;
  overflow: auto;
}

By implementing this solution, the

margin in the provided snippet will no longer push down the #header div. For more information, refer to the provided link.

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