Fixed Positioning in CSS

Now we'll look at fixed positioning. It's similar to absolute, the difference is how these types of positioning behave when there's a scrollbar.

When scrolling the page, absolutely positioned elements will scroll along with the page. See the example:

html<div id="elem"></div>
<div id="content">
  some long text
</div>

css#elem {
  position: absolute;
  top: 30px;
  right: 30px;
  width: 100px;
  height: 100px;
  border: 1px solid green;
}

#content {
  margin: 0 auto;
  width: 300px;
  text-align: justify;
  font: 16px Arial;
}

Результат:

You can make a positioned element stay in place when scrolling the page by setting it to fixed position using the position property with the value fixed:

html<div id="elem"></div>
<div id="content">
  some long text
</div>

css#elem {
  position: fixed; /* set fixed positioning */
  top: 30px;
  right: 30px;
  width: 100px;
  height: 100px;
  border: 1px solid green;
}

#content {
  margin: 0 auto;
  width: 300px;
  text-align: justify;
  font: 16px Arial;
}

Результат: