Highlight Color of Selected Message in Outlook for Mac

I have my Outlook for Mac inbox setup with the list of emails on the left and the reading pane on the right.  When scrolling through the list of messages in the list on the left, in my inbox as well as messages stored in other folders, it is very difficult for me to tell which email is selected in the list.  Many years ago, when a message was selected in the list it was highlighted in a deep blue color… Now it’s a very faint light blue color that is really hard for me to see (yes I do have some vision issues... but it's also so faint I have to imagine others have the same issue).  

As a result, I frequently delete the wrong email etc. because I can't tell what is actually highlighted.  Is there a way to change the default color of a highlighted message in the list, to make it easier to tell which message is highlighted?  I tried messing around with the overall theme in the settings, and while the red theme made it a bit better I sort of hate the look of the other themes... so is there a way to only change of the highlighted message? If not, do you have any recommendations on how to avoid these mistakes?

Thanks for your help