Drop-shadow help

I’m trying to create a drop shadow to go under the callout section like the one i’ve exampled under highlights.

I thought it would would be as simple as putting the code under .bottom like i had done with .callout, but i don’t want it to affect any other bottom.md’s. Sorry if this doesn’t make much sense. I think i created the callout section in a very convoluted way.

If anyone has any ideas, i would be very appreciative.

Website: http://thecabinetshop.co.uk I’m referring to the white section beneath the slider.