[HMBeaty]

In the template additional.css change forum-main-header to this:

.forum-main-header {
    background: transparent;
    margin: -10px 70px 0;
    border-top: #cccccc 0px solid;
    border-right: #cccccc 0px solid;
    border-left: #cccccc 0px solid;
    width: {vb:stylevar doc_width};
    min-width: {vb:stylevar doc_minWidth};
    max-width: {vb:stylevar doc_maxWidth};
    -moz-border-radius: {vb:stylevar border_radius};
    -webkit-border-radius: {vb:stylevar border_radius};
    padding: 10px;
}