Below are some block styling options you can choose from. They vary in color bars across the top of the content. The classes with padding adds a light grey background and left and right padding, most useful for center aligned text and images, or just getting some seperation from the blocks next to each other. Experiment with them and find what best suits your layout.
To add these to your block, place ONE of the classes in the CSS Block Class field as seen below:
red-border
orange-border
gold-border
yellow-border
green-border
blue-border
grey-border
merced-river-blue
red-border-padded
orange-border-padded
gold-border-padded
yellow-border-padded
green-border-padded
blue-border-padded
grey-border-padded
merced-river-blue-padded