Make the error page responsive and mobile friendly

# Description
The error page should be made responsive and user experience should be good on all screen sizes.

# Relevant Files
- https://github.com/webevaluator/webevaluator.github.io/blob/master/src/pages/ErrorPage/index.jsx
- https://github.com/webevaluator/webevaluator.github.io/blob/master/src/pages/ErrorPage/styles.js