Does anyone have any idea where I should be looking to remove the box borders on custom blocks?

I am sure that it will be in the css - I have some understanding of css but the Viart one always throws me. An answer to this would be very welcomed.

Try checking
 
http://www.viart.com/css_reference_table.html
Block (all blocks on the site) ***
 
Chris

It does depend on the style you are using but as a general answer its good to look at the source of a page using the View > Source menu selector on the browser.
 
Then search the html for some text contained within a custom block. From this its possible to see the way in which the css file causes each element in turn to make up the visual layout.
 
A starting point is the ".block" class which often defines the borders.
 
In the css file if you insert "/*" before the line you want to modify and "*/" after it it changes the line to a comment and its ignored. You can then save the css file, reload the page you were looking at and see the result. If the modification doesn't work remove the comments, save and try somewhere else.

Same here, I am using the default white template and want to remove the faint blue border which is about 4mm thick and also ammend cell padding so things are a bit nearer the edge.
 
Another frustartion is the space the block leaves if you don't add a title for the block. It seems to reserve the space a title would take up. It is all wasted space but I don't know how to fix it.