Paragraphs of blogposts too wide

Hi there dear Support Team,

All of a sudden the paragraphs of my blogposts are wider than they used to be.

I also sent you a screenshot with my markings so you can see more clearly. Is there any code I could use to make the paragraphs more narrow?
All the Best an Thank you very much

Hey there

I hope you are well today and thank you for your question.

You can try achieving this by adding the following CSS code in the Custom CSS option of your theme on the below path.

Admin Area -> Appearance -> Customize -> Additional CSS

/*reduce space on mobile */
@media (max-width: 550px){
.single-post h3 {
    margin: 3px 0;
 .single-post p {a
    margin: 5px 0;

Best Regards,