\documentclass[tikz]{standalone}
\usepackage{tikz}

\definecolor{codeblue}{RGB}{69, 161, 248}
\definecolor{codegray}{RGB}{40, 40, 40}
\usetikzlibrary{shapes,arrows}
\tikzstyle{decision} = [diamond, draw, fill=codegray, text=white,
    text width=4.5em, text badly centered, node distance=3cm, inner sep=0pt]
\tikzstyle{block} = [rectangle, draw, fill=codeblue,  text=white,
    text width=5em, text centered, rounded corners, minimum height=4em]
\tikzstyle{line} = [draw, -latex']