fix(css): Interference with other modules' styles fixed
fix(css): Interference with other modules' styles fixed

Other modules also use the same css classes. It's better to use a more narrow scope for the css. Reference is the default MM modules such as the [weatherforcast module](https://github.com/MichMich/MagicMirror/blob/master/modules/default/weatherforecast/weatherforecast.css).

fixes #17
references #9
LukeSkywalker92/MMM-DWD-WarnWeather