Hello,
If you want to change this color then goto appearance>>customize>>custom css and paste it:
.page-template-start-php .unit_content .quiz_meta .inquiz_timer span.countdown {
color:green !important;
}
Refer: https://prnt.sc/spsp0u
If this is not according to you then please share screenshot as well for better support and page url also after that i will provide you site specific code,
Thanks,
I am not sure whether you are using react quizzes or the old quiz. In both cases the CSS will be different
This CSS will work for old quiz
Paste in wp-admin > Appearance > Customize > Custom CSS
.single-quiz .quiz_timer canvas {background-color:#ff0000 !important}
This white area can't be changed: http://prntscr.com/sqin3y
Because we are using HTML Component and the color is already defined in that We are not defining color here