You didn't change it to put the id in front of all that code.
Code:
#cat51 .forumhead + .childforum .L2:first-child .forumrow, #cat51 .forumhead + .L2 .forumrow {
border-top: 0 none;
}
#cat51 .forumrow .table {
height: 100px;
}
#cat51 ol.childforum {
float: left;
margin: 0;
padding: 0;
width: 100%;
}
#cat51 .childforum li.forumbit_post {
clear: none;
float: left;
margin: 0;
padding: 0;
width: 50%;
}
#cat51 #forums .L1 .L2 {
clear: none;
}
#cat51 .forumbit_post .forumrow .forumlastpost {
clear: both;
width: 95%;
}
#cat51 .forumbit_post .forumlastpost .lastpostby {
display: block;
float: left;
}
#cat51 .forumbit_post .forumlastpost .lastpostdate {
display: block;
float: right;
}
#cat51 .forumbit_post .forumlastpost .lastposttitle {
display: block;
float: left;
}
#cat51 .forumbit_post .foruminfo {
clear: right;
float: left;
min-width: 50%;
width: 70%;
}
#cat51 .forumbit_post .forumstats, #cat51 .forumbit_post .forumstats_2 {
width: 20%;
}
#cat51 .forumbit_post .forumlastpost .lastposttitle {
display: block;
float: left;
}
#cat51 .forumbit_post .foruminfo {
clear: right;
float: left;
min-width: 50%;
width: 70%;
}
#cat51 .forumbit_post .forumstats, #cat51 .forumbit_post .forumstats_2 {
width: 20%;
}