# UI-Canvas

User Interaction Elements provide easy to configure gameObjects that allow for user interaction with the game.  In this section, we'll discuss how to create and position UI elements in a scene.

## Canvas

All UI elements are children of the Canvas class. When the first UI element is added to a scene, in addition, a Canvas gameObject and an EventSystem gameObject are also added to a scene, these are required to be in the Hierarchy for every scene that has UI elements to be displayed and have interactivity.

### Canvas: Configure ScreenSpace-Camera

When the Canvas is added to a scene, by default, the canvas layout is offset from the main camera. For our purposes, it is easiest to configure the Canvas Component so that it's rendered in the same position as the regular game scene. To do that, we need to change the Render-Mode of the Canvas, we'll change it from Screen-Space Overlay to `Screen Space - Camera`, and we'll select the `Main Camera` as the `Render Camera` for the Canvas Component. See image and animation below to configure the `Render Mode` of the Canvas to be `Screen Space Camera`, with the `Render Camera` set to `Main Camera`.



