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in Technique[技术] by (71.8m points)

css - Div not 100% width of browser

My div will not stretch the full width of the browser, it stops short on both ends by about 10px.

.header {
  position: relative;
  background-color: #088ed7;
  width: auto;
  height: 20px;
}
<div class="header">...</div>
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0 votes
by (71.8m points)

It's likely the page's margin and/or padding.

Add:

html, body {
  padding: 0;
  margin: 0;
}

.header {
  margin: 0;
}

html,
body {
  padding: 0;
  margin: 0;
}

.header {
  margin: 0;
  position: relative;
  background-color: #088ed7;
  width: auto;
  height: 20px;
}
<div class="header">...</div>

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