i don’t know what are percentages that i have to write on css to resolve it
Can you tell us which course this is for? There are many courses with a step 41. Also, please paste your HTML and CSS in here so we can see what you have done.
To display your code in here you need to wrap it in triple back ticks. On a line by itself type three back ticks. Then on the first line below the three back ticks paste in your code. Then below your code on a new line type three more back ticks. The back tick on my keyboard is in the upper left just above the Tab key and below the Esc key.