8- Develop a personal web page for yourself using HTML, CSS, and Javascript

Use the following HTML tags to design your webpage ...,

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Use an external css to change the default style of your webpage. Use at least one element selector, one id selector, and one class selector.


Using text input and submit button, allow the user to change the background col- or of your web page to red, blue, or yellow. When the user clicks the submit but- ton to change the background color, you must first validate the user input to make sure the entered color is valid ( red, blue, and yellow are valid colors). Then, you should change the background color of your web page. If the user didn't enter a valid color, you should prompt the user to enter a valid color.