.lang li a img{
    border-radius: 100%;
    height: 30px;
    width: 30px;
}
.lang li a img:hover{

    border: 2px solid #8BC34A;
    box-sizing: border-box;
    transition: 0.1s all;
}
.lang li a img.active{

    border: 2px solid #8BC34A;
    transition: 0.1s all;
}