Change colour of border of column & rows
In Excel 2016 it is not possible to change the border colour of the columns and rows – in previous versions it was easy to see (e.g. if you were in cell e.g. 'F' '100' the edge/border of the appropriate column & row would be in a sharp colour) but now hardly visible as in grey/green colour which can’t be changed.
In trying to be subtle and fashionable you've made it hard to use.
For tools to get a job done, form should follow function.