gistfile1.tex

\documentclass [11pt] {article}

\usepackage [margin=0.5in, letterpaper] {geometry}
\usepackage {lipsum}
\usepackage {tabularx}
\usepackage {color}

\newcommand {\header} [1] {{\color {YaleBlue} #1}}
\definecolor {YaleBlue} {RGB} {54, 95, 145} %{15, 77, 146}

\begin {document}

\parindent 0pt

\begin {tabularx} {\textwidth} { @{} l X @{} }
Fancy header
&
\header {Fancy header}
\tabularnewline
\end {tabularx}

\end {document}