'Full width two column and its responsive

Please click to see the layout

hi, I am trying to structure the layout in its best way, I tried 2 div 50% 50% it working, but what confuses me is the left side top element and right side bottom element

I cant share the project I worked on, also it has too much coding, but it will be helpful if you can guide me with the outline and its CSS see the sample website https://biomedicalengineeringcompany.com/marketspace/login

thank you



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