how to make a square in css code example

Example 1: how to create a shape in css

div {
	clip-path: polygon(100% 100%, 100% 100%, 100% 100%)
}

Example 2: how to make a square div in css

.square {
    background-color: #000;
    width: 50vw;
    height: 50vw;
}
.square h1 {
    color: #fff;
}
/* It works */