408
in zetagenesis theme in the content.css there exist the following:
body.newbb .xodata-list .xodata-title {
margin: 0;
background: #4AA3F6 url(../img/table-caption3.png) repeat-x left top;
padding: 2px .25em;
color: #fff;
font-size: 1em;
font-weight: bold;
border: 1px solid #65ACEE;
}
from the above code remove the following line
background: #4AA3F6 url(../img/table-caption3.png) repeat-x left top;
now put the old default theme code at the bottom of the content.css file
.outer {border: 1px solid #c0c0c0;}
.head {background-color: #c2cdd6; padding: 5px; font-weight: bold;}
.even {background-color: #dee3e7; padding: 5px;}
.odd {background-color: #E9E9E9; padding: 5px;}
.foot {background-color: #c2cdd6; padding: 5px; font-weight: bold;}
tr.even td {background-color: #dee3e7; padding: 5px;}
tr.odd td {background-color: #E9E9E9; padding: 5px;}
This worked for me, hope it will be helpful for others too.