Deco CSS - add a margin

Hi all,
I am working with the deco theme in drupal 6, and i have managed to style it so that it looks how i want, bar one little thing which is driving me mad. I want to add a margin to every page, like most sites have.
I have managed to resize the content and sidebars so that the space has been created, and now the margin exists, but it is white. I want to make it black but have no idea how to as the space in question is just extra padding for the content section, and not an actual div. I am using the triple sidebar layout also.
Heres my layout.css, just the relevant parts (i think) /* CONTENT layout */#content {  float: left;  width: 100%;  padding-bottom: 2em;}.sidebar-double #content, .sidebar-left #content {  margin-left: -221px;}.sidebar-double #content, .sidebar-right #content {  margin-right: -271px;}.sidebar-right-double #content {  margin-right: -448px;}/* Add blanks left and right for the sidebars to fill */.sidebar-double #squeeze, .sidebar-left #squeeze {  margin-left: 221px;}.sidebar-double #squeeze, .sidebar-right #squeeze {  margin-right: 271px;}.sidebar-right-double #squeeze {  margin-right: 448px;  }/* Add whitespace to content area */#squeeze {    padding-left: 50px;  padding-top: 1em;  padding-bottom: 1.5em;  overflow: hidden;}#content { margin-right: 30px; }.sidebar-double #squeeze, .sidebar-left #squeeze {  padding-left: 2em;}.rightbar #squeeze {  padding-right: 2em;}/* SIDEBAR layout */#sidebar-wrapper .sidebar {  float: left;  z-index: 2;  position: relative;}#sidebar-left {  width: 240px;}#sidebar-right-sec {  width: 200px;  padding: 1.2em 0;        }#sidebar-right {  width: 248px;  padding: 1.2em 0;    }.rightbar .top-corners {  right: -8px;  top: -3px;  padding-right: 8px;  position: relative;  min-height: 12px;}.rightbar .bottom-corners {  right: 0;  bottom: -4px;  position: relative;  min-height: 7px;}/** * TRIPLE COLUMN layout * Overrides some previously declared css rules */.sidebar-triple #content {  float: none;}.sidebar-triple #sidebar-wrapper .sidebar {  width: 30%;  padding: 1.2em 0;}.sidebar-triple #content {  clear: both;}.sidebar-triple #sidebar-right-sec {  margin: 0 4%;}
Any help appreciated,
thanks