이미지에 보이는곳에 마우스오버를 하면 블루컬러가 나오는데

나오기 전에 흰색 박스부분들을 각자 다른 이미지를 삽입하고싶어요.

/* section.main3 */
.main_content .main3{width:100%;margin:0;height:450px;padding-top:0px;}
.main_content .main3 .noti,
.main_content .main3 .tit,
.main_content .main3 .cont{width:1200px;margin-left:auto;margin-right:auto}
.main_content .main3 .cont{font-size:15px;line-height:27px;}
.main_content .main3 ul{overflow:hidden;margin-top:-50px;padding:0 20px}
.main_content .main3 li{float:left;width:25%;height:480px}
.main_content .main3 li .fe_box{height:400px;margin:0 5px;padding:0 10px;border:1px solid #333;background-color:#f6f6f6;text-align:center;-webkit-transition: all .2s ease-out;-moz-transition: all .2s ease-out;-o-transition: all .2s ease-out;transition: all .2s ease-out}

.main_content .main3 .fe_box h2{font-size:21px;color:#555;font-weight:normal}
.main_content .main3 .fe_box p{margin-bottom:80px;font-size:15px;line-height:24px;color:#f6f6f6}
.main_content .main3 .fe_box a{display:inline-block;height:40px;padding:0 40px;border:2px solid #f6f6f6;font-family:'Open Sans',sans-serif;font-size:13px;letter-spacing:1px;color:#f6f6f6;line-height:40px;font-weight:600;-webkit-transition: all .2s ease-in-out;-moz-transition: all .2s ease-in-out;-ms-transition: all .2s ease-in-out;-o-transition: all .2s ease-in-out;transition: all .2s ease-in-out}
.main_content .main3 .fe_box a:hover{background-color:#f6f6f6;border-color:#f6f6f6;color:#cda25a}
.main_content .main3 .fe_top{position:relative;top:0;-webkit-transition: all .2s ease-out;-moz-transition: all .2s ease-out;-o-transition: all .2s ease-out;transition: all .2s ease-out}
.main_content .main3 .fe_bottom{position:relative;top:192px;-webkit-transition: all .3s ease-out;-moz-transition: all .3s ease-out;-o-transition: all .3s ease-out;transition: all .3s ease-out}
.main_content .main3 .fe_box.on{background-color:#cda25a}
.main_content .main3 .fe_box.on .fe_top{top:-104px}
.main_content .main3 .fe_box.on .fe_bottom{top:-67px}
.main_content .main3 .fe_box.on h2{color:#f6f6f6}

소스에서 밑줄친빨간 부분이 흰색박스에 컬러를 변경하는 부분인데요

저기에서 컬러를 지정하면 한번에 컬러가 4개 다 바뀌는데 여기에서 각각 따로 하려면 어떻게 해야하는지 ㅠㅠ고수님들 도와주세용..