Hi @rahul8aggarwal,
Your website is in development mode so we can’t check this issue, whenever you publish your website feel free to ping this thread so we can take a look what is the style that’s overwriting the color for cart icon.
Also, you can try to inspect the element in the front-end and check where is the color coming from for the cart icon. If you are not feeling comfortable with browser inspector – here is a great guide about it: https://developers.google.com/web/tools/chrome-devtools/css
I hope that helps!