h2{
    font-size: 32px;
    height: 100%;
    overflow: hidden;
    text-align: center;
    clear: both;
    margin-bottom: 50px;
}

h2 span{
    padding: 15px 0;
    display: inline-block;
    border-bottom: 1px solid #333;
}

#about{
    width: 1200px;
    height: 100%;
    overflow: hidden;
    line-height: 30px;
    margin: 50px auto;
}

.about-desc{
    height: 100%;
    overflow: hidden;
    text-align: justify;
}

.about-desc p{
    margin-bottom: 15px;
}

.about-strength{
    height: 100%;
    overflow: hidden;
    margin-top: 50px;
    text-align: center;
}

.about-strength dl{
    width: 300px;
    height: 100%;
    overflow: hidden;
    margin-bottom: 30px;
    display: block;
    float: left;
}

.about-strength dl dt{
    margin-bottom: 20px;
}

.about-strength dl dt i{
    font-size: 48px;
    width: 80px;
    height: 80px;
    line-height: 80px;
    text-align: center;
    border-radius: 50%;
    border: 2px solid #333;
}

.about-strength dl dt i:hover{
    color: #fff;
    background: #404e5f;
    border: 2px solid #404e5f;
}

.about-strength dl dd span{
    font-size: 50px;
    position: relative;
}

.about-strength dl dd sup{
    font-size: 12px;
    position: absolute;
    right: -30px;
    top: 10px;
}

.about-strength dl dd p{
    font-size: 20px;
    font-weight: bold;
}



#factory{
    height: 100%;   
    overflow: hidden;
    padding: 50px 0;
    background: #f1f3f7;
}

.factory-list{
    width: 1200px;
    height: 100%;
    margin: 0 auto;
    overflow: hidden;
}

.factory-list ul{
    height: 100%; 
    overflow: hidden;
}

.factory-list ul li{
    width: 285px;
    height: 188px;
    overflow: hidden;
    display: block;
    float: left;
    margin: 0 20px 20px 0;
}

.factory-list ul li:nth-child(4n){
    margin-right: 0;
}

.factory-list ul li img{
    width: 285px;
    height: auto;
    display: block;
}


#certificate{
    width: 1200px;
    height: 100%;    
    overflow: hidden;
    margin: 0 auto;
    padding: 50px 0;
}

.certificate-list{
    height: 100%;
    overflow: hidden;
}

#certificate ul li{
    width: 265px;
    height: 400px;
    overflow: hidden;
    display: block;
    float: left;
    border: 10px solid #f1f3f7;
    margin: 0 20px 20px 0;
}

#certificate ul li:hover{
    border: 10px solid #404e5f;
}

#certificate ul li:last-child{
    margin-right: 0;
}

#certificate ul li img{
    width: 265px;
    height: auto;
    display: block;
}

@media (max-width: 600px){
    .banner-about {
        background: none;
    }

    h2{
        font-size: 2.3rem;
        margin-bottom: 3rem;
    }

    h2 span{
        padding: 1rem 0;
    }

    #about{
        width: auto;
        line-height: 2rem;
        padding: 0 1rem;
        margin: 3rem auto;
    }

    .about-desc p{
        margin-bottom: 1rem;
    }

    .about-strength{
        margin-top: 3rem;
    }

    .about-strength dl{
        width: 50%;
        margin-bottom: 2rem;
    }

    .about-strength dl dt{
        margin-bottom: 1.5rem;
    }

    .about-strength dl dt i{
        font-size: 4rem;
        width: 6rem;
        height: 6rem;
        line-height: 6rem;
    }

    .about-strength dl dd span{
        font-size: 3.5rem;
    }

    .about-strength dl dd sup{
        font-size: 0.8rem;
        right: -2rem;
        top: 0.5rem;
    }

    .about-strength dl dd p{
        font-size: 1.2rem;
    }

    #factory{
        padding: 3rem 0;
    }

    .factory-list{
        width: auto;
    }

    .factory-list ul{
        height: auto; 
        overflow: hidden;
        padding: 0 1rem;
    }

    .factory-list ul li{
        width: 100%;
        height: auto;
        margin: 0 0 2rem 0;
    }

    .factory-list ul li img{
        width: 100%;
    }


    #certificate{
        width: auto;
        padding: 3rem 0;
    }
    
    .certificate-list{
        padding: 0 1rem;
    }

    #certificate ul{
        width: 100%;
        height: 100%;
        overflow: hidden;
    }

    #certificate ul li{
        width: 49%;
        height: auto;        
        margin-right: 2%;
        margin-bottom: 1rem;
        box-sizing: border-box;
        border: 10px solid #f1f3f7;
    }

    #certificate ul li:nth-child(2n){
        margin-right: 0;
    }

    #certificate ul li img{
        width: 100%;
        height: auto;
    }
}


@media (min-width: 600px) and (max-width: 960px){
    .banner-about {
        background: none;
    }

    h2{
        font-size: 2.3rem;
        margin-bottom: 3rem;
    }

    h2 span{
        padding: 1rem 0;
    }

    #about{
        width: auto;
        line-height: 2rem;
        padding: 0 1rem;
        margin: 3rem auto;
    }

    .about-desc p{
        margin-bottom: 1rem;
    }

    .about-strength{
        margin-top: 3rem;
    }

    .about-strength dl{
        width: 50%;
        margin-bottom: 2rem;
    }

    .about-strength dl dt{
        margin-bottom: 1.5rem;
    }

    .about-strength dl dt i{
        font-size: 4rem;
        width: 6rem;
        height: 6rem;
        line-height: 6rem;
    }

    .about-strength dl dd span{
        font-size: 3.5rem;
    }

    .about-strength dl dd sup{
        font-size: 0.8rem;
        right: -2rem;
        top: 0.5rem;
    }

    .about-strength dl dd p{
        font-size: 1.2rem;
    }

    #factory{
        padding: 3rem 0;
    }

    .factory-list{
        width: auto;
    }

    .factory-list ul{
        height: auto; 
        overflow: hidden;
        padding: 0 1rem;
    }

    .factory-list ul li{
        width: 49%;
        height: auto;
        margin-right: 2%;
        margin-bottom: 1rem;
    }

    .factory-list ul li:nth-child(2n){
        margin-right: 0;
    }

    .factory-list ul li img{
        width: 100%;
    }


    #certificate{
        width: auto;
        padding: 3rem 0;
    }
    
    .certificate-list{
        padding: 0 1rem;
    }

    #certificate ul{
        width: 100%;
        height: 100%;
        overflow: hidden;
    }

    #certificate ul li{
        width: 49%;
        height: auto;        
        margin-right: 2%;
        margin-bottom: 1rem;
        box-sizing: border-box;
        border: 10px solid #f1f3f7;
    }

    #certificate ul li:nth-child(2n){
        margin-right: 0;
    }

    #certificate ul li img{
        width: 100%;
        height: auto;
    }
}