в ipb_styles.css править надо
#branding {
-webkit-box-shadow: rgba(0,0,0,0.5) 0px 1px 5px;
-moz-box-shadow: rgba(0,0,0,0.5) 0px 1px 5px;
box-shadow: rgba(0,0,0,0.5) 0px 1px 5px;
height: 200px;
}
Заменить на
#branding {
-webkit-box-shadow: rgba(0,0,0,0.5) 0px 1px 5px;
-moz-box-shadow: rgba(0,0,0,0.5) 0px 1px 5px;
box-shadow: rgba(0,0,0,0.5) 0px 1px 5px;
height: 400px;
}