There are two ways to link your code here.
For example this is the link to your code.
One way is click the share button at upper right of a code, get the url and paste here.
Second way is use + button at right of this input textbox, choose Code, and choose My Code, and choose your code.
Welcome to SoloLearn.
I see that you are already studying SoloLearn CSS course.
You should ask a specific question.
Providing your code, explaining what you get stuck at, so that we can guide you accordingly.
Please show your code here using code playground.
gorgilla the gamer
Yes you are using CSS class and width correctly.
For animation, read the lesson I linked above.
If you don't understand, you are missing the intermediate knowledge. Proceed the CSS course until you reach that lesson.