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I'm trying to access the body tag but it seems it's not possible using document.getElementsByTagName(tagName) and $A.util.addClass, I want to add a background image, I was trying to do it in the component's style file but couldn't make it work.

Any ideas or suggestions to follow, please?

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You can use the .THIS class in the Lightning Component style file. .THIS refers to the whole lightning component.

Step 1:

Get the url of the static resource that is similar to this format resource/#############/resourceName.

You can get this simply by adding the static resource reference in Lightning Component Markup(Component File) - {!$Resource.imageResourceName} enter image description here

Once you run the component - it will show the URL of the static resource. enter image description here

Step 2:

Just grab the URL that you got in step one and add it in the .THIS class, something like this:

.THIS{
background-image: url('/resource/1556180826000/Arunachala_pic') !important; 
}

And that's it!

enter image description here

I hope this helps! :)

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