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After adding angular material theme Font size gone small. #issue

I am using bootstrap as well as angular material in my project but after adding angular material theme in "angular.json" font gone small but when I remove them then again it works well but component doesn't work. such as :--

after adding angular material theme : image

Without angular material theme : image

you can see in image "India Today" have some problem but not in only that.

I have checked all possible way but still it's not working