Change the location of blocks on the mobile output

[webarion]

I have a Left-Main-Right main layout.
On a wide screen, the layout correctly shows Left-Main-Right.
On a mobile device, this layout shows:
Left
Main
Right
I need the main layout on a mobile device to be like this:
Main
Left
Right
How can i do this?

[pablop76]

Use flexbox in queries media