This problem is kind of types of Website. You had design static center orianted panel for website. now for your solution you have to try the Responsive Website Design in which there is separate codes are availble through which you can design your website for perticular device.
Like how to design the responsive website design,
visit this link[
^]. you will know how to design the responsive design.
or else you can also try the liquid design which will be design in % so that might be also helpful to you.