Build a Noise Generator in HTML, CSS & JavaScript - Easy Noise Grid Generation

Learn how to build a simple noise generator using only HTML, CSS & JavaScript! Easy noise generation!
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igot this error at the very end of the project:
main.js:46 Uncaught TypeError: Cannot set properties of null (setting 'fillStyle')
at DrawGrid (main.js:46:23)
at main.js:54:5