Line 185 of slickgrid.css:

div.odd{
  background: #F7F7F7!important;
}

Needs to be changed to:

.slickgrid-wrapper div.odd{
  background: #F7F7F7;
}

I would much prefer if modules didn't use !important at all, but certainly using it on something this generic is a major, major problem, and there is absolutely no need for it. I sure hope this module is still maintained in some capacity, this should be a really easy (but completely critical) fix.

Thanks very much for an otherwise awesome module!!