.knowledge-list,.knowledge-class-list {
    margin: 0 -10px;
}
.knowledge-list .item,.knowledge-class-list .item {
    width: 25%;
    margin: 0 auto 30px;
    padding: 0 10px;
}
.knowledge-list .item:nth-child(4n+1),
.knowledge-class-list .item:nth-child(4n+1){
    clear: left;
}
.knowledge-class-list .item .box{
    border: 1px solid #FDB7B7;
    -webkit-border-radius: 10px;
       -moz-border-radius: 10px;
            border-radius: 10px;
    overflow: hidden;
    max-width: 273px;
    margin: 0 auto;
    background: url(../images/bg1.jpg);
}
.knowledge-class-list .title{
    font-size: 19px;
    color: #F83939;
    text-align: center;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    margin: 5px 0;
}
.knowledge-class-list .pic{
    position: relative;
}
.knowledge-class-list .pic:before{
    content: " ";
    position: absolute;
    background: rgba(252,222,222,0);
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    opacity: 0;
    z-index: 11;
}
.knowledge-class-list .box:hover .pic:before{
    background: rgba(252,222,222,0.5);
    opacity: 1;
    transition: all .3s ease-in-out;
}
.knowledge-list .item .box{
    border: 1px solid transparent;
    padding: 10px 10px 20px;
    background: url(../images/bg1.jpg);
    max-width: 275px;
    margin: 0 auto;
}
.knowledge-list .box:hover{
    border-color: #FDB7B7;
-webkit-transition: all 200ms linear;
   -moz-transition: all 200ms linear;
     -o-transition: all 200ms linear;
	transition: all 200ms linear;
}
.knowledge-list li .pic{
    position: relative;
    overflow: hidden;
    margin: 0 auto 20px;
    max-width: 248px;
}
.knowledge-list .title {
    color: #F83939;
    font-size: 17px;
    margin: 10px 0;
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    height: 28px;
}
.knowledge-list .description{
min-height:48px;
}

@media screen and (max-width: 1200px) {
    .knowledge-class-list .item,
    .knowledge-list .item {
        width:33.33%;
    }
    .knowledge-list .item:nth-child(4n+1),
    .knowledge-class-list .item:nth-child(4n+1){
        clear: unset;
    }
    .knowledge-list .item:nth-child(3n+1),
    .knowledge-class-list .item:nth-child(3n+1){
        clear: left;
    }
}
@media screen and (max-width: 860px) {
    .knowledge-class-list .item,
    .knowledge-list .item {
        width:50%;
    }
    .knowledge-list .item:nth-child(3n+1),
    .knowledge-class-list .item:nth-child(3n+1){
        clear: unset;
    }
    .knowledge-class-list .item:nth-child(3n+1),
    .knowledge-list .item:nth-child(3n+1){
        clear: left;
    }
}
@media screen and (max-width: 480px) {
    .knowledge-class-list .item,
    .knowledge-list .item {
        width:100%;
    }
}