How can I make a coloured box and write in the box in html ?

Answer 1

I don't know if you mean an input field or a textarea, but you can do it like this:

<input style="background-color:red;">

or a textarea:

<textarea style="background-color:red;"></textarea>

both of them will have a red background... you can replace the red with a color word of your choice or use RGB, RGBA or Hex.

Answer 2

You can put an image.