I'm creating a `beamer` presentation. This is my code:

```
\documentclass{beamer}

\usetheme{Berlin}
\useoutertheme{miniframes} %Titelbalken
\setbeamertemplate{blocks}[rounded][shadow=true]

%Packages
\usepackage{amsmath, amssymb, amsthm}

\newenvironment{te bewijzen}[1][]
{\textbf{Te bewijzen:} #1}

\newenvironment{bewijs}[1]{
    \pushQED{\qed}
    \textbf{Bewijs:} #1}
{\popQED}

\begin{document}

\section{Deelvraag 1}

\subsection{Bewijs}
\frame{\frametitle{Bewijs}
    \begin{block}{Block}
        some text in my block
    \end{block}
    \begin{te bewijzen}
        this is what I have to prove
    \end{te bewijzen}
    \begin{bewijs}
        \begin{align*}
                               & line 1\\
            \Longrightarrow~    & line 2\\
            \Longrightarrow~    & line 3\\
            \Longrightarrow~    & line 4
        \end{align*}
\end{bewijs}
}

\end{document}

```

As you can see, the block and the text underneath are a bit close together and I don't really like that. How can I get some more space between them?