Empty Spotlight

Inktober day 26 prompt: Dark

Demo: https://www.dwitter.net/d/16317

Y=600-C(t/5)*250;with(x)for(fillRect(0,0,c.width|=z=i=1e3,2e3),ellipse(X=z+C(t/3)*(900-Y),Y,Y,Y/9,0,0,7);i--;fillRect(z+p*(X-z-Y),p*Y,2*Y*p,2))fillStyle=R(a=i?155-i/9:255,a,a*.7),p=i/z;x.fill()