Coding Problemz

I'm currently watching the "SPACEHEY TUTORIAL FOR BEGINNERS" Youtube video by Muimex and I've run into a problem. I was able to find the line(?) of code that was called main, attempted to put an url in like the youtuber did and then the code? just? disappeared? All of the code that was there has now been pressed into like 4 lines of code it seems and I can not relocate anything. I've tried refreshing the page and when I inspect the code it stays to the same 4 lines of code.

What happened

I just want my blog to look pretty