please solve this urgently, thank u so much

In this question suppose that HTML code and required CSS rules are done for you. When the page loads the yellow box will move from its location as described below. The box is just a

element with some CSS rules used to display and indicate the box position. Write ONLY JavaScript code that activates when the page loads, to allow the box to move every 1.5 seconds by 8 pixels from its location down to the left-bottom corner of the browser's window. When the box reaches its final destination just stops there and its background color to be changed into orange