#mydiv{
overflow: hidden;
width: 200px;
height: 200px;
margin: 100px;
background: red;
transform: rotate(45deg);
}
#mydiv img{
width: 200px;
height: 200px;
transform: rotate(-45deg) scale(1.42);
}
转载于:https://my.oschina.net/daladida/blog/741011