.mk_list{ overflow:hidden}
.mk_list li{overflow:hidden; margin-bottom:30px; background-color:#fbfbfb}
.mk_list li:nth-of-type(odd) .mk_left{ float:left; width:300px; height:225px; overflow:hidden}
.mk_list li:nth-of-type(odd) .mk_right{ float:right; width:850px; height:auto; }