title: Using PhpSpreadsheet, how do you set style for an entire sheet (not the whole spreadsheet)
body: <p>Using PhpSpreadsheet I want to get (or set) the style for an entire sheet (not the whole spreadsheet)
  I know the syntax for doing that for the whole spreadsheet
  <code>$spreadsheet-&gt;getDefaultStyle()-&gt;getFont()-&gt;setSize(100);</code></p>
  <p>and for a single cell
  <code>$spreadsheet-&gt;getActiveSheet()-&gt;getStyle('A1')-&gt;getFont()-&gt;setSize(100);</code></p>
  <p>but the same function for a whole sheet fails
  <code>$spreadsheet-&gt;getActiveSheet()-&gt;getStyle()-&gt;getFont()-&gt;setSize(100);</code></p>
  <p>What is the correct syntax for styling a whole sheet?</p>