How To Change Google Classroom Background. Basically Gallery gives you photos or artwork to use as your background image and Patterns gives. To use an image as a banner top frame in your classroom you need find images that are larger than 800 pixels wide and 200 pixels tall.
First choose a color for your banner that you plan to stick with over the school year. Use the File menu to Download as and choose PNG This will download the image to your computer so you can upload it into Google Classroom. A Google Classroom banner is 1000 x 250 pixels here is a template you can use.
Do an image search in Google for graphic images related to your topic.
Use the File menu to Download as and choose PNG This will download the image to your computer so you can upload it into Google Classroom. Change the dimensions to pixels. A new ChromaCam window will pop-up on the screen allowing you to choose a background and adjust a number of parameters including Filters Slide and Blur level. A video tutorial on how to change the colour and theme in your Google Classroom.