Write in CSS with js

Question

How can I Write in CSS code for all of my div tag with javascript. I think, I must use document.getElementById()?

Answer 1

Yes, get the required element and you can change its CSS property in js by writing like,
Suppose you want to change the background of an element.
element.backgroundColor= "#efefef" ;
Other properties can be get/set in the same manner.

Answer 2

Use:
element = document.getElementById("header");
element.style.backgroundColor= "#efefef";

Note that:
element.backgroundColor= "#efefef";
is not correct way to set css.

It should use style attribute to access its css.

https://code.sololearn.com/W4WCxLbqG67N/?ref=app

Answer 3

://Jquery is best for manipulating CSS

https://www.sololearn.com/learn/jQuery/2796/

Answer 4

Yes, I know this. But for all of my div tag, I use :
element = document.getElementsByTagName()
element.style.border = "solid black 1px"
And I take an ERROR...