# Different column width in tcolorbox with sidebyside option

The default output of sidebyside option in tcolorbox environment is two equal-side columns (Refer to the MWE). But what is needed is to produce difference two difference column width. How can we get the first column with .7\textwidth and the second column with .3\textwidth?

\documentclass{article}
\usepackage{tcolorbox}
\begin{document}
\begin{tcolorbox}[sidebyside]
hello world hello world hello world
\tcblower
world
\end{tcolorbox}
\end{document}

• You can use righthand width=.3\textwidth. Dec 23, 2016 at 6:00
• Pretty fine @SalimBou :) I looked for this key yesterday, I did not meet it. Actually, in was written in an illustrating example on page 67 of the manual. Dec 23, 2016 at 22:27

According to @SalimBou's comment, we can use the ready-made key righthand width.
\documentclass{article}