javaScript isn't style content

Question

I tried the same code in another stylesheet, it was working properly. But it's not working in SoloLearn code player. I want to do some styles with section tag through javaScript.
Kindly solve this BUGGgg.
https://code.sololearn.com/Wy7F9cy7fbvU/?ref=app

Answer 1

window.onload=function(){
document.querySelector('section').style.width="50%";
}
To allow script to run only after document get loaded,you can search for similar answers to know about it it more detail!

Answer 2

Thanks Abhay.
Now it's working fine