How can change css styles globaly… cause i want to provide a settings for the user… for example the user can change the font size using the range and the enable night mode using the switch… hope you can help me because i am stuck on this part and this is the last part of my project … TIA more powers 
You might find this stackoverflow topic really useful:
Espescially following comment on an answer: http://stackoverflow.com/a/21951183/3533712
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this is very useful thank you mister… but i want it to use it in a service so it will be availabe in various controllers …