void mainImage(out vec4 fragColor, in vec2 fragCoord)
{
    vec2 uv = fragCoord.xy / iResolution.xy;
    vec2 p = uv * 2.0 - 1.0;

    p.x *= iResolution.x / iResolution.y;

    float fakeBass = 0.5 + 0.5 * sin(iTime * 2.5);
    fakeBass *= 0.6 + 0.4 * sin(iTime * 0.75);

    float dist = length(p);

    float pulse = smoothstep(0.35 + fakeBass * 0.15, 0.34, dist);
    float glow = 0.025 / max(dist, 0.025);

    vec3 color = vec3(0.02, 0.04, 0.08);
    color += vec3(0.1, 0.6, 1.0) * glow * fakeBass;
    color += vec3(0.8, 0.15, 1.0) * pulse;

    fragColor = vec4(color, 1.0);
}