hope you can help?
I have got a standard tick button box which when you click on it goes blue with a white tick in it.
This works on my computer but when I view it on a mobile phone the tick box is black and not blue.
Not sure how to correct this? and why it is doing it
What browser/OS? Blue background is present in Firefox on smart phone (Android) and in chrome on tablet (Android).
I have tried in on iphone IOS and Android Haawei P smart and get the same issue. that the background colour is black and not blue.
What you are describing is caused by the browser default. If you want to change this, have a look at what this guy has done, https://css-tricks.com/custom-styling-form-inputs-with-modern-css-features/
Identify which browsers don't work as expected and don't forget vendor prefixes in your CSS code.