When you select the standard frame size, it's already in the safe display zone so that you can use the whole space for the grid system. These two resources can freshen up your knowledge and remove any other related confusions about grids & guides.
Any feedback/suggestion on this approach?
You're doing absolutely great!
Using the space
Removing the clutters
Focusing on the task (input in this case)
User should feel a good experience there
Should I use the same approach for normal inputs?
Although it's the best practice to keep the consistency in UI, interactions & layouts, that doesn't mean ...