header .banner {
    background-image: url(../image/banner5.png);   
}
main .title {
    color: black;
    font-size: 28px;
    margin: 80px auto 20px;
    font-weight: bolder;
}
main .underline {
    width: 50px;
    height: 0;
    border-bottom: 3px solid #0c7fa4;
    margin: 27px auto 30px;
}

main .certificate {
    padding: 70px 0;
    width: 367px;
    height: 600px;
}
main .certificate h3 {
    text-align: center;
    font-size: 26px;
    font-family: SourceHanSansCN, SourceHanSansCN-Bold;
    font-weight: 700;
    color: #1a4db4;
    line-height: 39px;
}

main .certificate p {
    text-align: center;
    font-size: 26px;
    font-family: SourceHanSansCN, SourceHanSansCN-Bold;
    font-weight: 700;
    color: #bad1ff;
    line-height: 39px;
}

main .certificate img {
    display: block;
    width: 235px;
    height: 332px;
    margin: 48px auto 0;
    transition: all .5s;
}

main .certificate img:hover {
    width: 276px;
    height: 390px;
}
@media screen and (min-width:1450px){
    .container {
        width: 1350px;
    }
}

@media screen and (max-width: 780px) {
    main .certificate {
        padding: 20px;
        height: 500px;
    }
    main .certificate h3{
        font-size: 16px;
        line-height: 30px;
        text-align: center;
    }
    
    main .certificate p {
        font-size: 14px;
        line-height: 20px;
        text-align: center;
    }
    
    main .certificate img {
        width: 235px;
        height: 332px;
        display: block;
        margin: 20px auto;
    }

    main .certificate img:hover {
        width: 235px;
        height: 332px;
    }
}