If changing the color does not work, then there is very likely a 3rd party CSS overriding it. For that, you can try this cusom CSS:
.proinput input.orig {
color: white !important;
}
You can disable the images here. When no images are used, then I probably recommend using the vertical results layout, as it may look better without the images. The isotopic results layout is designed specifically for results with images.