SOURCE

<div style="
    border-bottom: 35px solid red;
	border-left: 15px solid transparent;
	border-right: 15px solid transparent;
	width: 100px;
    transform:rotate(180deg)"
    ></div>

<div style="
    margin-top:10px;
	width: 100px;
    height:50px;
    background:red;
    transform:skew(10deg, 10deg)"
    ></div>