#ifdef GL_ES
precision mediump float;
#endif

uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;

void main() {
	// make a vector that puts all x and y values between 0.0 - 1.0 so we can use it as a color
	vec2 st = gl_FragCoord.xy/u_resolution;
	// use time to change the blue hue of the screen
	gl_FragColor = vec4(st.x,st.y,abs(sin(u_time)),1.0);
}