I created a new OpsBoard and added a RrdDashlet to it.
When I viewed the OpsBoard using Google Chrome 42 beta, the graph title box above the RRD graph had both vertical and horizontal scroll-bars on it. When viewed with Firefox 37 beta, the graph title box above the RRD graph just had the horizontal scroll-bar on it.
This appears to be due to the box class style added directly in RrdDashlet.java.
Using the developer tools for Chrome, unchecking the "overflow: auto;" from the box class style caused the scroll bars to no longer display.
I suspect KscDashlet will exhibit the same behavior, since it also adds a box style to the page.