Sometimes you need to change a part or whole background of your blogger post text.When you first click create new post .With nothing written in the post click on the HTML button.
you will see only the following code.
Now again switch to the compose mode and write some thing then go back to HTML mode.To change background of written text just add following code in HTML mode
Also you might have noticed that in this post i have changed background of some portion of my text and not all.To do this you have to put HTML code within your text from where you want to change color and close it by
command and repeat the HTML code where required. e.g
Some text goes here with no background color