Answer:

[tex]\begin{gathered}\begin{gathered}\small \\ \colorbox{red}{\boxed{ \rule{1pt}{99999pt}}}\colorbox{orange}{\boxed{ \rule{1pt}{99999pt}}}\colorbox{yellow}{\boxed{ \rule{1pt}{99999pt}}}\colorbox{green}{\boxed{ \rule{1pt}{99999pt}}}\colorbox{blue}{\boxed{ \rule{1pt}{99999pt}}}\colorbox{magenta}{\boxed{ \rule{1pt}{99999pt}}}\colorbox{purple}{\boxed{ \rule{1pt}{99999pt}}}\end{gathered}\end{gathered}[/tex]