change entire left column background to gray?

I need your help.  I'm trying to find a way to change the entire left column block background in profile to gray.  I only want the left column background to show gray in profile page only, not in every page.  is that possible? 

okay I think i remember.  I have to do it with design box?  sorry it's been a while.  :S

I want to do something similar. Where do I find "Design Box"?

Okay i remember now.  I use block tools from Deano but if you only need to switch design boxes, you can get it from here for free.  I don't know it will work with 7.1.

all you have to do is copy designbox_0.html and change it to whatever number you desire.  Example: designbox_99.html

  Then insdie designbox_99.html, you need to change "disignBoxFirst" to "disignBoxFirst2" then in /template/(default template)/css/common.css.  Add this under .disignBoxFirst { }.

.disignBoxFirst2 {
    position: relative;
    background-color: rgb(250,250,250);
}

Change whatever background you want, then go to tools block module or designbox switcher.  find the block and change it to 99  (that's designbox_99)  

Put this in base/templates/page_5.html after __page_main_css__

<style type="text/css">
#page_column_1 .page_block_container .disignBoxFirst {
      background: #fff;
}
</style> 

Sometimes the answers are simple.