Buttons and Text-Link in the content area

Hello I have a problem, It need to be fixed. I choose a blue color for the links in the content area (a dark color, so people can see it on white background) and for the buttons in the content area, I also choose blue (a dark color, so people can see it on white background). My problem is, the text in the button (when I put a Link in it), is also blue (he takes the color from the text link), so you can not see it in the button. I need white for the text link in the button, but when I choose white, also the text link in the content area is white on white background, so you can not see the text link anymore, I need to choose a different color for the text in the button, how can I do this?

Can you help me? Nobody can see the Text in the Button now and they will not click on it.

Best Wishes