Add white background
Add white background

Also optimised the SVG so it's now 4.35k rather than 10kb
SimenB/standard,leecade/standard,SimenB/standard,stevemao/standard,febeling/standard,reggi/standard,John-Lin/standard,standard/standard,jasonpincin/standard,mnquintana/standard,feross/standard,beni55/standard,icemobilelab/icemobile-standard,LinusU/standard,JedWatson/happiness,LinusU/standard,pombredanne/standard-1,JedWatson/happiness,ricardofbarros/standard,standard/standard,tjwudi/standard,koddsson/standard,feross/standard