Have edited the table colours for a reversed colour scheme to match my site design BUT the Show XXX entries dropdown does not change - unselected dropdown should have white text (background okay, probably transparent originally I would guess) and when selected it shows a white background with black text. Assume I must edit some CSS to fix this but can't identify which specific CSS to change.

URL http://labourlaw4-0.uwc.ac.za/

Scroll down to the tabs section and look at table on Articles tab

Sorry, notice I managed to get it to show white but after changing it it reverts to black …

Fixed this myself (eventually):

Custom plugin css is shown below:

button.btn.dropdown-toggle.btn-default, button.btn.dropdown-toggle.btn-default:hover, button.btn.dropdown-toggle.btn-default:active, button.btn.dropdown-toggle.btn-default:focus, button.btn.dropdown-toggle.btn-default:visited {
    color: #fff;
}