How to change theme

[HetalGohil]

i have used white font according to my project theme..but this dialoge in white so white text color is not visible so how can i change font..can you please provide theme so we can set according to our project theme.

[Bharavi26]

i have also same requirement, i want to change card payment dialog theme but there is not any feature to change color of dialog,
is there any possible way to change that,,,,anyone pls help me to figure out that...