Log on with your padmin account and go to Interface > Advanced page layout configuration. 
In section "Page layout, position and styles" you can define the basic layout settings. You have the following options: 
     
    
| #1 Page fixed width in pixels | 
Define here the desired width of the page in pixels. If this field is empty the page fills the whole screen (100%). | 
 
| #2 Page alignment to the browser window  | 
You can choose from "left-most aligned", "center" and "right most  aligned".   This will align the page according to your choise if a fixed width is defined in #1. | 
 
| #3  Indent to left of browser window | 
This puts a blank column, with width defined by the p-admin, leftmost of your page, only if fixed width in #1. | 
 
| #4 Page body background color | 
A hex value is expected (e.g. #cccccc ) to be entered for the color of the background. The option works only if width in #1 is fixed. | 
 
| #5  Page body additional style | 
You can use this to add additional style to body tag. The text you enter will be automatically put into a 'style="....."' tag property of the body. The option works only if width is fixed in #1. | 
 
|  #6 Page border colors | 
You can set the color in hex value of the the left, right and bottom border of the page. The option works only if width is fixed in #1. | 
 
|  #7 HEADER side borders | 
You can change the height and color of that part of the side page borders, that are topmost, around the header. | 
 
|  #8 FOOTER message text | 
You can post a custom footer message text.  This will replace the bottom border! This is a parsed text, just like the left frame info messages. Place here your HTML code. The option works only if width is fixed in #1. | 
 
|  #9 Hide footer if left frame hidden? | 
Check the checkbox to hide the footer when in fullscreen - when left frame is not visible. | 
 
 
  
Click on "Save" to apply the changes. 
   
 
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