The shader written in GLSL is being painted in yellow instead of displaying a gradient color?

Bugs
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The shader is displaying a solid yellow color instead of gradient color for some unknown reason. I even tried the shader in the Babylon Cyos editor (https://cyos.babylonjs.com/), and it still showed the yellow color. Is there something that I might have overlooked? Babylonjs playground for reference: Babylon.js Playground

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“resolution” is not a standard variable know by ShaderMaterial, you have to pass it explicitely:

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Thank you very much for fixing the issue. I would be grateful if you could provide me with a link to the documentation of shaders in the context of Babylon.js. Because you know, I was unaware of the fact that Babylon.js uses different conventions for passing variables to shaders; for example, u_time (uniform float u_time;) had to be changed to time for the shader to work."

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All the built-in variables known by ShaderMaterial are listed here:

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I want to express my heartfelt gratitude for the documentation you shared with me. Thanks again.