I'm trying to make a signature block which has enough room above the signature line for a stamp. But the indicated \vspace seems to have no effect.
How can I reserve 3cm above the \hline?
\documentclass[a4paper]{article}
\usepackage{tabularx}
\newcommand{\signatureline}[1]{%
\begin{tabular}{@{}p{6cm}@{}}
\vspace{3cm} % Increasing this seems to have no effect
\\ \hline \\[-.75\normalbaselineskip]
#1
\end{tabular}
\hspace{2cm}
\begin{tabular}{@{}p{4cm}@{}}
\vspace{3cm} % Increasing this seems to have no effect
\\ \hline \\[-.75\normalbaselineskip]
Date
\end{tabular}
\\
}
\newcommand{\approval}{%
\par\vspace*{\fill} % Puts signature lines in the same spot of each page for easy stamping
\section*{Approvals}
\signatureline{Operator} % Putting \vspace after this doesn't put space between these signaturelines
\signatureline{Authority}
\clearpage
}
\begin{document}
Some text
\approval
\end{document}
