.div1
{
position: relative;
height: 150px;
width: 150px;
margin: 50px;
padding:10px;
border: 1px solid black;
perspective:150px;
}
.div2
{
padding:50px;
position: absolute;
border: 1px solid black;
background-color: red;
transform: rotateX(45deg);
}
/* */