2 How-To's on White Background removal on your post on Blogger

Method 1.1: White Background on Pasted Content.

When you copy a text from another site or article, chances are that when you paste it on your composition, it would have a white background coming along with it. If you wish to remove this, just hover over your toolbar and find this icon:

Click on that icon and it will immediately remove the embedded background on your text. This is similar to the "Keep Text Only" Option on Microsoft Office's Word. 

Method 1.2

Before pasting the text, instead of CTRL+V, do CTRL+SHIFT+V or right-click then choose the "Paste as plain text" option.

Method 2: White Background on Published Content.

Go to your posts and edit the post you want to rid white background of. Look back to your toolbar and locate the HTML tab.

Once you are on the HTML page, press CTRL+F on your keyboard. A pop-up tab will appear. It will look like this.

Type in background.

Locate everything that says style="background-color: white;" and delete everything you found.

Save your work.