/*div{
	box-sizing: border-box;
}
a{
	text-decoration: none;
}*/

.m_container {
    width: 660px;
    height: auto;
    margin: auto;
    padding-top: 80px;
    padding-bottom: 120px;
}

.m_containe .content {
    width: 100%;
    font-size: 0;
}

.m_containe .content ul {
    margin: 0;
    padding: 0;
}

.content .b_li {
    display: inline-block;
    perspective: 500px;
    width: 580px;
    height: 380px;
    margin-left: 20px;
}

/*.content .b_li:nth-of-type(1){
	width: 480px;
}
.content .b_li:nth-of-type(5){
	width: 660px;
}
.content .b_li:nth-of-type(1),.content .b_li:nth-of-type(4){
	margin-left: 0;
}*/

.content .b_li_first {
    margin-left: 0;
}

.content .b_li_bottom {
    perspective: 900px;
    height: 400px;
    width: 600px;
    margin-top: 20px;
}

.b_item {
    height: 100%;
    width: 100%;
    background-color: #E0F3FF;
    padding: 30px;
    position: relative;
    border-radius: 4px;
    transform-origin: 10% 10%;
    transition: all .2s linear;
}

.b_item:hover {
    transform: rotate3d(0, 1, 0, -3deg);
    box-shadow: 0 5px 20px 0 rgba(198, 211, 220, 0.14);
    /*width: 370px;*/
}

.b_item_bottom:hover {
    transform: rotate3d(0, 1, 0, -2deg);
}

.b_item:hover .b_item_btn {
    display: block;
}

.b_item .title {
    margin: 0;
    font-size: 26px;
    line-height: 40px;
    color: #1A2736;
}

.b_item .title a {
    display: inline-block;
    float: right;
    height: 34px;
    width: 34px;
    cursor: pointer;
}

.b_item .describe {
    display: block;
    margin: 0;
    font-size: 16px;
    line-height: 30px;
    text-align: justify;
    color: #37475A;
    margin-top: 10px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
}

.b_item .b_item_link {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    cursor: pointer;
    z-index: 100;
}

.b_item_btn {
    display: none;
    position: absolute;
    left: 0;
    bottom: 0;
    height: 50px;
    padding-left: 30px;
}

.b_item>.downloadNow {
}

.b_item_btn:hover img {
    margin-left: 10px;
}

.b_item_btn img {
    vertical-align: top;
    margin-left: 5px;
    transition: margin-left .2s ease-in;
    -moz-transition: margin-left .2s ease-in;
    -webkit-transition: margin-left .2s ease-in;
    -o-transition: margin-left .2s ease-in;
}

.b_item_btn span {
    margin: 0;
    font-size: 14px;
    line-height: 20px;
    color: #007FDF;
}

.b_item_pic {
    position: absolute;
    right: 30px;
    bottom: 30px;
    z-index: 99;
}

@media screen and (max-width: 768px) {
    .m_container {
        width: 80%;
    }
    .content ul .b_li {
        width: 100% !important;
        margin-left: 0;
    }
    .content .b_li:nth-of-type(1),
    .content .b_li:nth-of-type(4) {
        margin-left: 0;
    }
}

@media screen and (max-width: 480px) {
    .content ul .b_li {
        height: 380px;
    }
    .b_item .title {
        font-size: 24px;
    }
    .content ul .b_li_bottom {
        height: 420px;
    }
    .b_item .describe {
        font-size: 14px;
    }
}

@media screen and (max-width: 375px) {}