I am sorry to be pain in the ########
I found the solution on other post
http://www.zen-cart.com/forum/showthread.php?t=81852

#mainWrapper {
background-color: #ffffff;
text-align: left;
max-width: 90%;
min-width:895px;
vertical-align: top;
border: 1px solid #4682B4;
}

Sorry to be a pain the the ########
PS for admin: you can delete this post if you wanted

Cheers