To can center a fixed or absolute positioned element (Div or other block element), set the right and left CSS properties to 0, and then margin-left and margin-right to auto, as if you were centering a static positioned element.
- Example, centering a fixed Div:
<style type="text/css">
#divid {
  position: fixed;
  /* center the element */
  right: 0;
  left: 0;
  margin-right: auto;
  margin-left: auto;
  /* give it dimensions */
  min-height: 8em;
  width: 90%;
  background: #dafeda;
}
</style>

<div id="divid">https://CoursesWeb.net/</div>
- Example, centering an absolute positioned Div (the parent element must have: position: relative):
<style type="text/css">
#parent{
 position:relative;
 height:8.5em;
}
#divid {
  position: absolute;
  /* center the element */
  right: 0;
  left: 0;
  margin-right: auto;
  margin-left: auto;
  /* give it dimensions */
  min-height: 8em;
  width: 90%;
  background: #dafeda;
}
</style>

<div id="parent">
  <div id="divid">https://marplo.net/jocuri</div>
</div>
Demo:
https://CoursesWeb.net/

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which HTML element can be used to embed a SWF flash content?
<object> <div> <script>
<object type="application/x-shockwave-flash" data="file.swf" width="500" height="250">
 <param name="src" value="file.swf" />
 Your browser not support SWF.
</object>
Which CSS pseudo-class adds a style to an input form field that has keyboard input focus?
:active :focus :hover
input:focus {
  background-color: #88fe88;
}
Click on the instruction which converts a JSON string into a JavaScript object.
JSON.stringify(javascript_object) object.toString() JSON.parse(json_string)
var jsnstr = '{"url": "http://coursesweb.net/", "title": "Web Development Courses"}';
var obj = JSON.parse(jsnstr);
alert(obj.url);
Indicate the PHP function which can be used to create or write a file on server.
fopen() file_put_contents() file_get_contents()
if (file_put_contents("file.txt", "content")) echo "The file was created";
else echo "The file can not be created";
Center Fixed and Absolute element

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