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Fixing formatting in Camera Setup section

worksheet2.md

@@ -69,18 +69,18 @@ With the hardware set up, we can begin to program the software that will make ev
 
 1. Now that we know the buttons work, let's set up the code for the camera. First add an import statement to the existing ones at the top of the program:
 
-  ```python
-  from picamera import PiCamera
-  ```
+    ```python
+    from picamera import PiCamera
+    ```
 
 1. Locate the existing line `take_pic_btn.when_pressed = take_picture` and, below it, add the following code to set up the camera object:
 
-  ```python
-  camera = PiCamera()
-  camera.resolution = (800, 480)
-  camera.hflip = True
-  camera.start_preview(alpha=128)
-  ```
+    ```python
+    camera = PiCamera()
+    camera.resolution = (800, 480)
+    camera.hflip = True
+    camera.start_preview(alpha=128)
+    ```
 
 This code creates a 'PiCamera' object with the resolution set to 800 × 480, which is the resolution of the Raspberry Pi touchscreen. We also tell the camera to flip the preview horizontally (`hflip`): if we don't do this, the preview image will be mirrored, which makes it hard for people to align themselves with the overlays! We then start the preview with alpha set to `128` so that it is semi-transparent; this is in case we get an error and need to see what is happening underneath. When you are confident that your code works, you can remove the `alpha=128` to make the preview fully opaque.