A : Global Variables

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Add color constants for:
MID_GRAY using the grayscale value 216
MID_DARK using the grayscale value 192

Declare a variable btn01 for the File button.
It will be an instance of the RectButton class.
Declare four integers to be used with it.
The complete code is:

int btn01_x1, btn_y1,   // top left corner
    btn01_w,  btn01_h;  // width and height