a_{0}^{(1)} =
\textcolor{orange}{
\sigma\left(
\textcolor{currentColor}{

\textcolor{green}{w_{0,0}} a_{0}^{(0)} +
\textcolor{green}{w_{0,1}} a_{1}^{(0)} +
\cdots +
\textcolor{green}{w_{0,n}} a_{n}^{(0)}
\textcolor{blue}{+ b_{0}}

}
\right)
}