I love this theme, so crisp and classy thank you

the only thing I'm not keen on is when you need to select or delete something such as an email it dosent change colour so you dont know if its actually selected or not, hope you know what I mean. Someone else explained it and may make more sense:

2. When selecting items to delete, for example, the selected items don't really look that different compared to the non-selected ones. The black background used to distinguish them isn't that noticeable