Why is there an indent between fields?

Question

PHP

Hello, please tell me why there is an indent between the first two fields. Here is the PEN In the code there seems to be no hints of margin between them.

Answer 1

Something like this

Answer 2

count how many times they occur
filter out those that occur more than once
sandbox.onlinephpfunctions.com/code/345aa637324f57...

Answer 3

This is the space between inline elements. Fighting the Space Between Inline Block
Elements