Board Thread:Support Requests - Getting Technical/@comment-30398052-20170708114315/@comment-23989026-20170708125955

Coding has preset...
 * padding → from the border edge inwards
 * margin → from the border edge outwards

You need to over-ride it. Some of the coding I use...
 * cellpadding="0"
 * cellspacing="0"
 * style="padding:0"
 * style="margin:0"

The hardest part is locating at which level (changes layout within here) the preset margin or padding that needs over-riding

  Containing Table   A table inside this cell of the Containing Table

...