Once you install this extension, click the dropper and drag the crosshairs around the page. You will see that each time you scroll over a new color, a new combination of letters and numbers appear. These are often referred to as hex color codes. As soon as you find the color you want, click on it to lock in the hex color. Copy the number and use it in use it to create customized colors in Google Docs, Slides, Sheets, and Drawings.
Similar extensions include ColorZilla, Eye Dropper, and ColorHexa Search Tool. You can learn more about hex colors here.
Applications for Education
Understanding how to use hex colors in presentations is a useful skill for anyone who creates presentations. It helps us use different tools to their fullest potential and have more control over how our finished products look.