
Make It Disappear
<style type="text/css">
.comments { display: none; }
</style>
Alternatively you can hide your comments table using the options on the edit profile page:

Borders
To get rid of the comments border:
<style type="text/css">
.comments, .comments td { border: none; }
</style>
Or, to put a border of your own on it:
<style type="text/css">
.comments { border: 1px solid deeppink; }
.comments td { border: none; }
</style>
Nb, the
.comments td { border: none; } part is because the comments table has an
inner border too.
[ More Border Styles ]

Background
To set a background color:
<style type="text/css">
.comments { background: red; }
</style>
Or a background image:
<style type="text/css">
.comments { background: url('http://www.PATH TO YOUR IMAGE.gif'); }
</style>
More on
[ Backgrounds ]

Text Styles
The comments table contains both plain text and links. If you want them all to match, you could give
them all the same styles, like this:
<style type="text/css">
.comments, .comments a:link, .comments a:visited, .comments a:hover {
color: red;
font-size: 8pt;
}
</style>
Or, you could style them all differently, like this:
<style type="text/css">
.comments {
color: red;
font-size: 8pt;
}
.comments a:link, .comments a:visited {
color: orange;
text-decoration: none;
font-weight: bold;
}
.comments a:hover {
color: green;
background: yellow;
text-decoration: underline overline;
}
</style>
More
[ Text Styles ]

Size
You can change the width of the comments table:
<style type="text/css">
.comments { width: 400px; }
</style>

Positioning
You can use margins to set a bit more space above or below, or even to the left or right of the comments
table (Nb, the comments table is 100% the width of the page by default, so to set a left or right margin
for it you would first have to give it a width).
<style type="text/css">
.comments { margin-top: 50px; }
</style>