Auto-growing textarea

[rdefaux]

Hello,

I would like to know if it would be possible to have an auto-growing textarea containing the highlighted code working like https://css-tricks.com/the-cleanest-trick-for-autogrowing-textareas/

When I remove the height from code-input css, the textarea containing the code is well growing, but when I suppress text it doesn't shrink...

Thanks for your help Romaric