Normal Approximation to Coin-Flip Counts

A fair coin is flipped $n = 400$ times independently. Let $S$ denote the total number of heads. Using the Central Limit Theorem, approximate $P(190 \le S \le 210)$.

You may use the fact that $\Phi(1) \approx 0.8413$, where $\Phi$ is the standard normal CDF.