一个beamer封面样例,我添加了一条橙色线段后,与彩色盒子有错位,如何保持水平与盒子宽度对齐呢?
\begin{beamercolorbox}[wd=\beamer@plainpagewidth,center,sep=2\baselineskip]{frametitle}%
\tikz\draw[orange,line width=5pt] (0,0)--(\beamer@plainpagewidth,0);
{\usebeamerfont{date}\insertdate}\vspace*{\baselineskip}
{\usebeamerfont{author}\insertauthor}\vspace*{\baselineskip}
{\usebeamerfont{institute}\insertinstitute}
\end{beamercolorbox}\vspace*{\baselineskip}