$($Linear Gradient$)$ Create a div element with a width and height of $500$px$.$ Create a diagonal linear gradient using the co$($Linear Gradient$)$ Create a div element with a width and height of $500$px$.$ Create a diagonal linear gradiors of the rainbow$$Red$,$ Orange, Yellow, Green, Blue, Indigo, Violet.lors of the rainbow$$Red$,$ Orange, Yellow, Green, Blue, Indigo, Violet.