There is one graphical issue.with the thread title and category. it needs a background when you scroll down on the thread.
here is the fixed css code
.docked .d-header {
background: rgba(0,0,0,0.9)!important;
color:FFF!important;
}
.docked .d-header .extra-info-wrapper .topic-link, .docked .d-header .badge-wrapper.bullet span.badge-category, .docked .d-header .title a {
color:#FFF!important;
}