.model-wrap {
    margin: 0 auto;
    padding: 1rem 0;
}

.model-list {
    display: flex;
    flex-wrap: wrap;

}

.model-item {
    width: 3.5rem;
    min-height: 3.2rem;
    background: #F5F5F5;
    margin-right: .53rem;
    margin-bottom: .65rem;
    color: #333333;
    position: relative;
    padding-bottom: .5rem;
    overflow: hidden;
     transition: all .3s; 
}

.model-item:nth-child(4n) {
    margin-right: 0;
}

.model-en {
    padding: .5rem .4rem .1rem .4rem;
    font-family: Source Han Sans CN, Source Han Sans CN;
    font-weight: 500;
    font-size: 0.18rem;
    color: #333;
    transition: 0.3s;
    font-weight: bold;
}

.model-cn {
    font-family: Source Han Sans CN, Source Han Sans CN;
    font-weight: 500;
    font-size: 0.25rem;
    padding: 0 .4rem;
    color: #333;
    transition: 0.3s;
    font-weight: bold;
}

.model-icon {
    display: flex;
    justify-content: flex-end;
    margin-top: .4rem;
}

.model-icon img {
    width: .9rem;
}

.model-icon2 {
    display: none;
}

.model-letter {
    width: 100%;
    padding: 0 .4rem;
    font-family: Arial, Arial;
    font-weight: 900;
    font-size: 0.8rem;
    color: #00A1E9;
    opacity: .5;
    position: absolute;
    bottom: -0.13rem;
    left: 0;
    transition: all .365s;
}

.model-item:hover {
    background: #00A1E9;
    color: #fff;
}
.model-item:hover .model-en,
.model-item:hover .model-cn {
    color: #fff;
}
.model-item:hover .model-icon1 {
    display: none;
}

.model-item:hover .model-icon2 {
    display: block;
}

.model-item:hover .model-letter {
    color: #fff;
    opacity: 1;
}


@media only screen and (max-width:768px){
    .model-item{
        width: 3.3rem;
        margin-right: 0;
    }
    .model-list{
            justify-content: space-between;
    }
}<!--0.00019001960754395-->