style

[PeterBreen]

CSS is extremely basic; make it look more like a fishtank at least

[PeterBreen]

CSS is now written in SASS as of #12 but the style issue still requires addressing

[PeterBreen]

Further addressed in #21, adds a small amount of gradient to give the water a better look.

Next step: find a bottom 'sand' effect or something to give the tank an actual sense of place.