comment button:
in red.css:
input[type=submit]:hover { background: #313428; }
and in default.css:
input[type=submit] { font-family: 'Lucida Grande', Arial, Helvetica, sans-serif; background: url(../../images/feed-title-white.jpg) repeat-x; border: 1px solid #CCC; padding: 5px 10px; font-size: 12px; color: #000; font-weight: 700; border-radius: 3px; -moz-border-radius: 3px; -webkit-border-radius: 3px; }
input[type=submit]:hover { background: #313428; color: #FFF; }
changing css is tedious, just keep searching.
you can get the corresponding css classes or ids by looking into the html code in the browser; or by using tools suchs as firebug or firefox web developer add-on.
to remove the html below the comment form, look into comments.php, search for ‘comment_form()’ and adjust according to:
https://codex.www.ads-software.com/Function_Reference/comment_form
(there are threads about this in this forum)