#cert{
    display: flex;
    flex-wrap: wrap;
}
#cert li{
    flex: 1;
    width: 33.33%;
    max-width: 33.33%;
    min-width: 33.33%;
    font-size: 0;
    vertical-align: top;
    border-bottom: 1px solid #F5F5F5;
    border-left: 1px solid #F5F5F5;
    padding: .2rem;
}
#cert li:nth-of-type(-n+3){
    border-top: 1px solid #F5F5F5;
}
#cert li:nth-of-type(3n){
    border-right: 1px solid #F5F5F5;
}
#cert li:last-of-type{
    border-right: 1px solid #F5F5F5;
}
.cert_img{
    text-align: center;
    height: 2rem;
}
.cert_img img{
    max-width: 100%;
    max-height: 100% !important;
}
.cert_text{
    text-align: center;
    font-size: .14rem;
}
@media screen and (max-width:750px){
    .cert_img img{
        width: auto !important;
        height: auto !important;
    }
    #cert li{
        width: 100%;
        min-width: 100%;
        max-width: 100%;
        border-top: 0;
        border-left: 1px solid #F5F5F5;
        border-right: 1px solid #F5F5F5;
        border-bottom: 1px solid #F5F5F5;
    }
    #cert li:nth-of-type(-n+3){
        border-top: 0;
    }
    #cert li:nth-of-type(1){
        border-top: 1px solid #F5F5F5;
    }
}