Hi, Woswasi
You need to create some custom CSS to change the colors on the ListSelect components...
There is a few good guides that explains how to change the appearance/CSS of the different components that has been rather useful to me.
https://atmaworkflow.com/2014/10/24/primer-applying-custom-css-to-workflow-forms/
https://atmaworkflow.com/2014/10/21/list-select-alternating-row-colors/
Hope this helps you in the right direction.