Moving this image a bit

I don't know if post this on the MyBB support or here but it's css related so I think it's the right place.

I want to move this image



To here



I tried with position: absolute and doing top: 90px; left: 90px; but it just disappears.

Any idea on how could I do it?

CSS

.custom_theme{
background-image: url('images/daro/cp/color-swatches.png'); float: right;
}