Why Does a Top Margin on an Inner Element Displace Its Parent Div, and How Can I Fix It?

Margin-Top Affecting Wrapper Div Placement

When applying a top margin to the initial visible element on a page, such as a header division, it can inadvertently displace the entire division. This is the result of the browser's default cascading behavior.

To overcome this issue, a solution is to implement the following CSS rule to the parent division:

overflow: auto;

By specifying this rule, the parent division will adjust its height to accommodate the top margin of the inner element, preventing the division from being pushed down.

Here is an updated code snippet incorporating this solution:

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

div#header h1 {
  text-align: center;
  width: 375px;
  height: 50px;
  margin: 50px auto;
  font-size: 220%;
  background: url('/images/name_logo.png') no-repeat;
}

By implementing this technique, the top margin applied to the h1 element will no longer affect the positioning of the header division.

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