View run sheet - service content - make it scrollable

[tbar0970]

You often want to look at the run sheet and the service content at the same time
Service content is generally much longer, if you've got all lyrics etc in there
At the moment if you scroll right down, you can't see the run sheet.
Solution: Make the service content into a scrollable pane.

div.service-content {
    height: 85vh;
    overflow: auto;
    margin-bottom: 5vh;
    padding: 10px;
}

[tbar0970]

Maybe consider this
https://stackoverflow.com/questions/22808040/fading-out-text-on-overflow-with-css-if-the-text-is-bigger-than-allowed