Remove default selected row and add green background on the list (CSS/JS)

I need: 1. To remove 2 selected rows in my shipping methods list (i don't know why the second shipping method on screen is selected on green - it should not - the script should mark only one shipping method - the less expensive) 2. When selecting a shipping method also the selected shipping name (bolded) should have green background (as in the first one - as an example on screenshot). Easy job.