\documentclass[ ]{article}
\usepackage{pgfgantt}
\definecolor{foobarblue}{RGB}{0,153,255}
\newganttchartelement{foobar}{
foobar/.style={
shape=rounded rectangle,
inner sep=0pt,
draw=foobarblue!50!black,
very thick,
top color=white,
bottom color=foobarblue!50
}
}
\begin{document}
\begin{ganttchart}[
vgrid,
inline,
progress label text=\relax,
]{1}{15}
\ganttfoobar{Bar 1}{1}{3} \\
\ganttfoobar{Bar 2}{3}{7} \\
\ganttfoobar{Bar 3}{9}{12}
\end{ganttchart}
\end{document}