body {
    padding-top: 44px;
}
.top-btns{
    position: absolute;
    position: absolute;
    right: 0px;
    top: 0px;
}
.top-btns .btn-refresh{
    padding:10px 16px 10px 20px;
    line-height: 24px;
    display: block;
    position: relative;
}
.courses-list .courses-item {
    background: #ffffff;
    margin-bottom: 16px;
}

.courses-list .courses-item .courses-item-inner {
    display: block;
    padding: 16px;
}

.courses-list .courses-item .courses-item-inner:after {
    content: "";
    display: block;
    clear: both;
}

.courses-list .courses-item .item-img-box {
    width: 30%;
    float: left;
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
    box-shadow: 2px 2px 5px 0px rgba(0, 0, 0, 0.1);
}

.courses-list .courses-item .item-img-box:before {
    content: "";
    display: block;
    padding-top: 56.25%;
}

.courses-list .courses-item .item-img-box:after {
    content: "";
    display: block;
    position: absolute;
    left: 0px;
    top: 0px;
    right: 0px;
    bottom: 0px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.courses-list .courses-item .item-des {
    margin-left: 30%;
    padding-left: 16px;
}
.courses-list .courses-item  .item-opper{
    padding-top:10px;
}
.courses-list .courses-item  .item-opper .btn-use{
    display: inline-block;
    padding:0px 10px;
    font-size: 14px;
    line-height: 24px;
    border-radius: 3px;
    border: 1px solid #0099ff;
    color: #0099ff;
}