LaTeX Beamer Block Title Spacing is different between block types

Question

I'm having an issue with the Blocks from the Beamer Package. The spacing below the title in these blocks is different between the different block types, in my case between exampleblock and alertblock. Here's an image that illustrates what I mean:

As you can see, the title in the top example block is closer to the body than the title of the bottom alert block. I would like to have the example block look the same as the alert block. How can I go about this?

Here's a minimal working example of my code:

\documentclass[aspectratio=169,xcolor=dvipsnames]{beamer}
\setbeamertemplate{navigation symbols}{}

\definecolor{blue}{rgb}{0,0.568627,0.862745}
\definecolor{lightblue}{rgb}{0.784313,0.901960,0.980392}
\definecolor{grey}{rgb}{0.713725,0.745098,0.776470}
\definecolor{lightgrey}{rgb}{0.898039,0.909803,0.921568}

\usecolortheme[named=black]{structure}

\setbeamertemplate{blocks}[default]
\setbeamercolor{block title}{bg=blue,fg=white}
\setbeamercolor{block body}{bg=lightgrey}
\setbeamercolor{block title alerted}{bg=white}
\setbeamercolor{block body alerted}{bg=lightblue}
\setbeamercolor{block title example}{fg=blue}
\setbeamercolor{block body example}{bg=lightblue}

\setbeamertemplate{itemize items}[circle]
\setbeamertemplate{itemize item}{\color{blue}$\bullet$}
\setbeamertemplate{itemize subitem}{\color{blue}$\bullet$}


\setbeamertemplate{frametitle}{\vspace*{1.7cm}\textbf{\small\insertframetitle}}

\begin{document}
    \frame {
        \frametitle{Vor-und Nachteile}
        \begin{exampleblock}{Vorteile}
            \begin{itemize}
                \item Vorteil 1
                \item Vorteil 2
            \end{itemize}
        \end{exampleblock}
        \begin{alertblock}{Nachteile}
            \begin{itemize}
                \item Nachteil 1
                \item Nachteil 2
            \end{itemize}
        \end{alertblock}
    }
\end{document}

Compiled with MiKTeX XeTeX on Windows 10

Answer 1

The difference between your example and alert blocks is that in one case you set the block title background colour to white, in the other case you don't set it. Beamer uses different margins for empty block backgrounds.

You can avoid the problem by either setting the colour for both cases or leave it empty for both, just be consistent.

\documentclass[aspectratio=169,xcolor=dvipsnames]{beamer}

\definecolor{blue}{rgb}{0,0.568627,0.862745}
\definecolor{lightblue}{rgb}{0.784313,0.901960,0.980392}
\definecolor{grey}{rgb}{0.713725,0.745098,0.776470}
\definecolor{lightgrey}{rgb}{0.898039,0.909803,0.921568}


\setbeamercolor{block title}{bg=blue,fg=white}
\setbeamercolor{block body}{bg=lightgrey}
\setbeamercolor{block title alerted}{bg=white}
\setbeamercolor{block body alerted}{bg=lightblue}
\setbeamercolor{block title example}{fg=blue,bg=white}
\setbeamercolor{block body example}{bg=lightblue}



\begin{document}
    \frame {
        \frametitle{Vor-und Nachteile}
        \begin{exampleblock}{Nachteile}
                    \begin{itemize}
                        \item Nachteil 1
                        \item Nachteil 2
                    \end{itemize}
        \end{exampleblock}
        \begin{alertblock}{Nachteile}
            \begin{itemize}
                \item Nachteil 1
                \item Nachteil 2
            \end{itemize}
        \end{alertblock}
    }
\end{document}