void mainImage(out vec4 fragColor, in vec2 fragCoord)
{
    vec2 uv = fragCoord.xy / iResolution.xy;
    vec2 pos = (uv.xy - 0.5);
    vec2 cir = ((pos.xy * pos.xy + sin(uv.x * 18.0 + iTime) / 25.0 * sin(uv.y * 7.0 + iTime * 1.5) / 1.0) + uv.x * sin(iTime) / 16.0 + uv.y * sin(iTime * 1.2) / 16.0);
    float circles = (sqrt(abs(cir.x + cir.y * 0.5) * 25.0) * 5.0);

    vec3 color = 1.0 - vec3(sin(circles * 1.25 + 2.0), abs(sin(circles * 1.0 - 1.0) - sin(circles)), abs(sin(circles) * 1.0));

    fragColor = vec4(color, 1.0);
}