h1, h2, h3, h4 {
    text-align: center;
}

h1 {
    font-size: 50px;
}

h2 {

}

.center-vertical {
    position: relative;
    top: 50%;
    transform: translateY(-50%);
}

ul, ol {
    list-style-type: none;
}

a:hover {
    text-decoration: none;
}

.navbar-toggle {
    background-color: inherit;
}

.icon-bar {
    border: solid 1px black;
}

.clearfix:after {
    content: "";
    display: table;
    clear: both;
}

@font-face {
    font-family: 'SourceHanSansCN';
    src: url("../fonts/Alibaba-PuHuiTi-Regular.ttf");
}

body, div, h1, h2, h3, h4, h5, p, ul, ol, li, dl, dt, dd {
    margin: 0;
    padding: 0;
    font-family: "SourceHanSansCN", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

.icon-bar {
    border: solid 0.5px black;
    background-color: white;
}

.top {
    margin-top: 40px;
}

.title {
    margin: 50px 0;
}

#top-h2 {
    margin-top: 20px;
    font-size: 20px;
    height: 22px;
    opacity: 1;
    font-family: Arial;
    color: rgba(51, 51, 51, 1);
    letter-spacing: 0px;
}

.deathline {

}

.banner {
    width: auto;
    background-size: cover;
    background-position: center right;
    background-image: url(../image/contact/联系我们@2x.png);
    color: white;
    height: 325px;
    position: relative;
}

.banner-zi {

    bottom: 10%;
    position: absolute;
}

.banner-line {
    left: 100px;
    bottom: 0px;
    width: 50px;
    border-bottom: 3px solid #3790e3;

}

.banner h2 {
    text-align: left;

    opacity: 1;
    font-size: 20px;
    color: rgba(255, 255, 255, 1);
    letter-spacing: 0px;
}

.banner h1 {
    text-align: left;
    opacity: 1;
    font-size: 50px;
    color: rgba(255, 255, 255, 1);
    letter-spacing: 0px;
    padding: 20px 0 10px;
}
/*主体*/
.contact-us-box{
    padding-top: 100px;
    padding-bottom: 100px;
}

/*实现翻转特效*/
*, *:before, *:after {
    box-sizing: border-box;
}

.content {
    display: flex;

    justify-content: center;
    align-items: center;
    flex-wrap: wrap;

    max-width: 400px;
    border-radius: 10px;
    transition: all 0.3s;
    position: relative;
    cursor: pointer;
    margin: 20px auto;
    height: 235px;
    opacity: 1;
    background: rgba(255, 255, 255, 1);
    top: 0px;


}

.contact-card-card {
    color: inherit;
    cursor: pointer;
    height: 235px;
    width: 100%;
    perspective: 1000px;
    position: relative;

}

.front,
.back {
    border: 1px solid rgba(0, 0, 0, 0.1);
    display: flex;
    border-radius: 6px;
    background-position: center;
    background-size: cover;
    text-align: center;
    justify-content: center;
    align-items: center;
    position: absolute;
    height: 235px;
    width: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    transform-style: preserve-3d;
    transition: ease-in-out 600ms;
}

.front {
    background-size: cover;
    color: #333;
    overflow: hidden;
    font-family: Poppins, sans-serif;
}

.front:before {
    width: 100%;
    height: 100%;
    position: absolute;
    display: block;
    content: '';
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;

    opacity: 1;
    z-index: -1;
}

.contact-card-card:hover .front {
    transform: rotateY(180deg);
}

.contact-card-card:nth-child(even):hover .front {
    transform: rotateY(-180deg);
}

.back {
    background: #fff;
    transform: rotateY(-180deg);

}

.contact-card-card:hover .back {
    transform: rotateY(0deg);
}

.contact-card-card:nth-child(even) .back {
    transform: rotateY(180deg);
}

.contact-card-card:nth-child(even):hover .back {
    transform: rotateY(0deg);
}

/*实现翻转特效*/
.contact-card {
    margin: 20px auto;
    max-width: 400px;
    border-radius: 10px;
    transition: all 0.3s;
    position: relative;
    cursor: pointer;
    border: 1px solid rgba(0, 0, 0, 0.1);
    height: 235px;
    opacity: 1;
    background: rgba(255, 255, 255, 1);
    top: 0px;
    /*box-shadow: 0px 3px 12px 0px rgba(0, 0, 0, 0.1);*/

}

.contact-card:hover {
    top: -15px;
    transition: 0.3s;
    box-shadow: 0 12px 16px rgba(0, 0, 0, 0.1);
}

.contact-card-icon {
    margin:0 auto;
    width: 76px ;
    height: auto;
}

.contact-card p {
    text-align: left;
}
.contact-card-title{
    font-size:20px;
}
.contact-card img {

}

.back img {
    height: 80%;
}

@media screen and (max-width: 768px) {
    .contact-card {
        height: 200px;
        padding: 20px;
    }

    .contact-card p {
        text-align: center;
    }

    .deathline {
        opacity: 0;
        border-color: transparent;
    }

    .contact-card-1 {
        top: 25%;
    }

    .contact-card-2 {
        top: 25%;
    }

    .banner h1 {
        text-align: center;
        font-size: 32px;
    }

    .banner h2 {
        text-align: center;
        font-size: 12px;
    }

    .top h1 {
        font-size: 23px;
    }

    #top-h2 {
        font-size: 13px;
    }
}
.footer-aboutus-title, .footer-aboutus-icon{
    font-size: 14px!important;
}
.footer-aboutus-icon{
    color: #5b6d85;
}
.footer-split{
    margin: 0 5px;
}