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void mainImage(out vec4 fragColor, in vec2 fragCoord) {
    vec2 uv = fragCoord / iResolution.xy;
    vec3 col = 0.5 + 0.5 * cos(iTime + uv.xyx + vec3(0, 2, 4));
    fragColor = vec4(col, 1.0);
}

void mainImage(out vec4 fragColor, in vec2 fragCoord) {
    vec2 uv = fragCoord / iResolution.xy;
    vec3 col = 0.5 + 0.5 * cos(iTime + uv.xyx + vec3(0, 2, 4));
    fragColor = vec4(col, 1.0);
}

✓ compiles clean

download .glsl

Use it as your wallpaper

Download the .glsl into ~/.config/neowall/shaders/.
Point your config at it, then neowall reload.

default {
  shader untitled.glsl
}