.shape-ex9{
    width: 200px;
    height: 200px;
    display: block;
    position: relative;
}
.shape-ex9::before{
    content: '';
    width: 0;
    height: 0;
    display: block;
    border-left: 100px solid transparent;
    border-top: 150px solid #666;
    border-right: 100px solid transparent;
    position: absolute;
    bottom: 0;
    right: 0;
}
.shape-ex9::after{
    content: '';
    width: 0;
    height: 0;
    display: block;
    border-left: 100px solid transparent;
    border-bottom: 50px solid #666;
    border-right: 100px solid transparent;
    position: absolute;
    top: 0;
    right: 0;
}