How to change CSS for default input text?

PHPMaker General Discussion (PHPMaker)
1

How to make the default input text more transparent? Normal text and the transparent faded text is too similar, need to increase transparency. Where can I adjust the CSS transparency value?BootStrap:

This is 25% opacity primary text
Where can I place “text-opacity-25” to make global default text in textbox more transparent?

2

You may try to change Bootstrap form control SASS variables under HTML → Theme.

3

I found:
placeholders-opacity-max: .5
placeholders-opacity-min: .2If I change both to .1, change to another theme Cyan and go back to Gray, it resets back to .5 and .2 againHow to save the changes?