Self-governed web creator needed. I need to fix minor bugs on simple web application, especially responsibility on mobile phones. .NET MVC web app

Hi HTML and .NET MVC expert, this web needs small fixes, especially improve responsibility on mobile phones. [login to view URL] You can try to use the web just now, there are no live data there, it is development server. Feel free to test anything. Register/activate tariff/deactivate tariff/change tariff, ... I will give you access to my Azure DevOps repository, you will clone the source code (.NET MVC web app). Then you will try to use the web as its visitor (on both PC and mobile phone), find bugs and other annoying things and fix them. OK? Your goal is to make web visitor happy. You should know how to use Azure DevOps (clone repository, create your branch, push commits to the repository). Don't worry about my Czech language, English is enough, I will be ready to help you. Features of the web (99% is already working): 1. Give information about the project for public visitor 2. Register user, login user, logout user. User is defined by email+password 3. User can activate (buy) tariff (licence) for one or more companies. Company is defined by "Company number (IČ)" and "Company name (Jméno společnosti). Selected tariff is written to the database, no payments or so needed. 4. User can CHANGE tariff for one of its companies. He selects company, then selects new tariff and confirm. New tariff is written to the database, old tariff is marked as inactive. Thanks for your offers, Milan