TYPO3 v8 has reached its end-of-life March 31st, 2020 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.
You can order Extended Long Term Support (ELTS) here: TYPO3 ELTS.
This sets margin-left to 10 and margin-bottom to 5. Top and right are not set (zero)
left, top, right, bottom