Forgot to modify stylesheet.css :

Add the following lines

.asnf_normal { line-height: 130%; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 11px; color:#333333;}

a.asnf_none:link { color: #ff6600; text-decoration: none}
a.asnf_none:visited { color: #ff6600; text-decoration: none}
a.asnf_none:hover { color: #0066ff; text-decoration: none }

.asnf_replyform { border: #999999; border-style: dotted; border-top-width: 2px; border-right-width: 2px; border-bottom-width: 2px; border-left-width: 2px}
.asnf_error { font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 15px; color:#990000; font-weight:bold;}

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