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Please give your valuable feedbacks. I was stuck on project to make image and text part to make it in half of the screen. tell me how can i make it easily. And also the alignment is not proper so please also let me know your suggestions to correct it

I made this project using HTML and CSS. The main problem I faced was to center the container div but I did it using flexbox and making the height as 100vh, if there is an alternate of it without making height as 100vh using Flexbox, kindly suggest me. And also I am not sure how it's working in mobile as I haven't used media queries so give your suggestions for it as well