Hello! Potentially answered a million times/nooby question but I've been unable to source the answer.
I've set my start icon to a custom image, it looks great I've resized it to 58 which was the best size for it astheticaly, however, when I mouse over it; it fades to block white! Which is super ugly.
I've looked around in settings and have found no immediately obvious setting for this. I just want to turn it off, or just have it fade into the same image as a work around.
Anyone know what I'm blathering about and know how to stop it?

Here's a shonky image of what I mean:

Non moused over = Great.
Moused over = BLEURGH.