Fix: continue learning cards

[naveen8801]

Issue Number

fixes #140

Describe the changes you've made

Styling of 'List ' element added and stylings of ' CourseCard ' component editted .

Additional context (OPTIONAL)

Test plan (OPTIONAL)

A good test plan should give instructions that someone else can easily follow.

Checklist

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] All new and existing tests passed.
• [x] The title of my pull request is a short description of the requested changes.