Samsung Galaxy Note 3 — urgent plz grey box on bottom of my note 3 screen

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Oct 19, 2015 6:58:14 PM via Website

My Samsung galaxy note 3 suddenly a grey box appeared in lower third of screen , it's a fade box I mean that the icons behind it can be seen but with a grey like slide on it and the touch in this area is working fine , also there is a neon green vertical line on the left margin of the whole screen and both the line and the box don't appear if I take screenshot
Any help please urgent !!!!