Canvas Accessibility in Files UI

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I just have have a few questions about the Canvas Files UI

I have switched to using the HighContrast UI in Canvas to enhance the theme colors, but I wanted know if  it possible to change the light blue highlight in the file's sections? It can be difficult to see the light blue against a white background to determine if something is selected.

Also, is it possible to add another option with a "Select All" feature? I understand that pressing "CTRL" + A when selecting a file accomplishes this, but it can also be useful to have a checkbox next to the file name, as well as making the number of items selected more visible so that it is not easily overlooked.  I look forward to any suggestions you all may have. Thanks!