Triangle Div -- With Border-image

Question

Hi im trying to make a the triangle div have a background image or border-image.

.desktop-layer6 {
width: 0;
height: 0;
top: 33.5%;
left: -18%;
position: absolute;
border-left: 670px solid transparent;
border-right: 600px solid transparent;
border-bottom: 650px solid aliceblue;
z-index: 30;

}