Html and css course part iii

My button is not placed inside the input element.
I just follow mosh course but the result on mine is something like this on mobile view.

How to fix this ?

Here is the browser version, it looks fine. but on mobile it is not becoming responsive

Please share the relevant code snippets (i.e. HTML and CSS)

Maybe your input element lose some css like w-full?

already solved. thanks guys