How to resize the a webpage automatically?

Hello all,



I found a website that can automatically resize the width using the options on the dropdown..(blue circle). Should I create two of the same website, with ccs file separately ?
and how (source) to create a toggle like in the red circle

Here is the website link http://theme-fusion.com/avada/

Thanks

 

Its not resizing the "page", per se, however the css is changing the width of the background element and box model for the container elements - its all the the CSS

 

Yes, its all CSS. If u want to try it latest way, google for "CSS3 Media Queries" and you will find the easiest way to d

 

Actually it is not re-size function. The div (in which DD is placed) , the width is set to auto or 100%.

 

yes, thanks all...i've been solve this problem.

 

Wow, Thank you for this tool. I did not know that resizing a webpage it could be done so easily.

 

Its only a question of specifying the height and width of all divs in your css in "percentage". Actually, you can find lot of tutorials regarding that