<style>

#DIV1{

    height: 200px;

    width: 200px;

    margin: auto;

    border: 1px solid black;

}

#DIV2{

    width:150px;

    height:150px;

    border: 1px solid black;

    background-color: coral;

    transform: rotate(45deg);

    -ms-transform: rotate(45deg); /* IE 9 */

    -webkit-transform: rotate(45deg); /* Opera、Chrome 和 Safari */

}

#DIV2original{

    position:absolute;