Different browsers, opposite outcomes?

Hey guys, I‘m kinda stuck with something. I‘m working on some HTML/PHP/CSS stuff on Eclipse. It looks just perfect in the browser that is integrated in Eclipse. However, if I open the page in Chrome or Edge, I get some very different outcomes. I put a logo on the page that I designed myself. Looks great in Eclipse, however Chrome and Edge both invert its colors and I cannot find why as it works in Eclipse! Similarly, my hyperlinks display as dimgrey (correctly) in Eclipse but as white in the external browsers. I do have white hyperlinks in my navigation, but the links that are the wrong color are not even remotely related to my side navigation. Any advice?