The solution I found was to make the CSS panel 0% by adding an id on the CSS panel and another entry in the CSS code
<panel depends="$alwaysHideCSS$" id="CSSPanel">
<html>
<style>
#CSSPanel{
width:0% !important;
}
#errorSinglePanel{
width:25% !important;
}
#errorStatsPanel{
width:30% !important;
}
#errorLineChartPanel{
width:45% !important;
}
</style>
</html>
</panel>
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