title: How Can I set block at the starting of the page
body: <p>Hi all someone know how I can put the block at the start of the page instead skipping 5 cm?</p>
  <pre><code>      \documentclass{tikzposter}
  \geometry{paperwidth=1080px,paperheight=1980px}
  
  \usetheme{Board}
  
  \begin{document}
  
  \node[above right,opacity=1.2,inner sep=0pt,outer sep=0pt] at (bottomleft) {\includegraphics[width=\paperwidth,height=\paperheight]{example-image-duck}};
  
  \maketitle % See Section 4.1
  \colorlet{blockbodybgcolor}{black}
  \colorlet{blocktitlefgcolor}{red}
  \block{\textbf{Ultrastructural anylisis}}{}
  \end{document}
  </code></pre>