.container {
    width: 200; 
    height: 200; 
    clip-path: polygon(50% 3%, 3% 100%, 100% 100%);
    background-color: black;
}
.elementStyle {
    width: 200;
    height: 200;
    clip-path: polygon(50% 3%, 3% 100%, 100% 100%);
}