You have to use the polygon function
.container{
width:445px;
height:670px;
overflow:hidden;
margin:30px auto;
shape-outside: polygon(170.67px 291.00px,126.23px 347.56px,139.79px 417.11px,208.92px 466.22px,302.50px 482.97px,343.67px 474.47px,446.33px 452.00px,443.63px 246.82px,389.92px 245.63px,336.50px 235.26px,299.67px 196.53px,259.33px 209.53px,217.00px 254.76px);
}