Map of the observable universe
Nice visualisation, but the explanations contain a bunch of mistakes. The cosmic microwave background is not "the first flash of radiation" after the big bang (which would've been much earlier), it is the "wall" of <i>last</i> scattering before the universe became transparent enough. And its distance is also not limited by light travel distance within the age of the universe (13.7Gly) but by its rate of expansion, resulting in an actual distance closer to 40Gly.