Make several edits on the website

After changing the PHP version from 7.0 to 7.4 on the OpenCart site, two elements have shifted slightly: the menu on the main page and the fields in the checkout process.

Design a letter for sending to clients (an example is attached), I will provide the text and the top image. This is just an example from GPT, could you make it more interesting?

What is needed: responsive layout (mobile-first), interactivity (model switcher, ROI calculator, comparison table, quiz selection), form with CRM integration and UTM tags, analytics setup, speed optimization. Design and layout: implement the website in our corporate style according to the technical specifications and brand book, adhere to corporate colors (accent orange CTA buttons), fonts, header style, and overall premium look of the brand. A consistent visual style across all screens, neat spacing and typography, quality work with photos and tables. We are ready to provide a design mockup, a color/font guide, and examples.

Hello, I need your help in implementing a task. Fix the bugs on the website page, the page displays a 404 error.

It is necessary to connect the application form on the landing page to keycrm. I will provide all necessary access. Please write how much time and cost this task will take.