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how can i make the button take up full width on mobile i find it difficult making the page take the mobile size i am having issues using media query to make the image take up mobile size i am unsure of the whole css(i am open to correction) please correct me how i can make it better

i found placing the card in the center difficult? i am open to correction or new ideas? im unsure of the body part and the classes? is there any way i wan make the code more accessible and easy to understand?