Flame effect with larger white part

main.tex

\documentclass{article}
\usepackage{tikz}

\definecolor{flameOuter}{HTML}{33AAFF}

\pgfdeclareradialshading{multigradient}{\pgfpoint{0cm}{0cm}}{%
  color(0cm)=(white);
  color(0.5cm)=(white);
  color(1cm)=(flameOuter)
}

\begin{document}

\begin{center}
  \begin{tikzpicture}
    \begin{scope}
      \clip (0,0) -- (6,0) arc (0:180:6cm) -- cycle;
      \fill[shading=multigradient] (0,0) ellipse (1cm and 6cm);
    \end{scope}
  \end{tikzpicture}
\end{center}

\end{document}