Here we have a nice, soothing melodic riff that incorporates inside picking.
Look closely at the tabs below. See how with every 2 notes you play, you're picking inside a pair of strings? The first 2 notes, you're picking inside the D and A strings, then the next 2 notes, you're picking inside the G and D strings. Then the process repeats.
Keep steady alternate picking here. And play it very slowly at first to make sure your technique is clean.