Easiest way to color textbox

[uskiara]

Hi, in addition to what @TIMAI2 has already suggested, by searchiing the forum you can find also several other methods.
One is here:

How do you add border to textbox?

How to add border to textbox in the App Inventor? Without the border, user can't tell where the text box is.

Or with an extension from @Patryk_F related to ListView.

Another method is to create an overlapping window by using another extension from @VSATISH13 In that window you can embed a layout with a background picture, the wanted textbox, and you can make it appearing and disappearing only when you need.

Overlap View Extension: Create overlying layout

OverlapView allows you to make a user interface without any limitations, now you can create overlying layouts as you imagined without increasing the size of your application via using png images. Blocks: Methods: [blocks (18)] Properties: [blocks (12)] Overlap View is allowed to be redistributed by MIT as part of the Appathon 2021 Example: Download : com.vsatish.overlapview.aix (7.2 KB)

By searching the forum is the best way to find a lot of possible solutions from wich you can learn, and that maybe you were not aware of.
All the best !