.nav-box {
    width: 100%;
}

.nav-box ul {
    display: flex;
    flex-direction: row;
    /*overflow: auto;*/
    flex-wrap: wrap;
}

.nav-box ul li {
    width: 50%;
    padding: .2rem .3rem;
}

.nav-box ul li a .item {
    width: 100%;
    height: 1.64rem;
    position: relative;
}

.nav-box ul li a .tit {
    position: absolute;
    top: calc(50% - .3rem);
    left: calc(50% - 1.28rem);
    color: #fff;
    z-index: 9999;
    font-size: .28rem;
    padding: .15rem;
    background: #1764da;
    width: 2.56rem;
    text-align: center;
    opacity: 0.8;
}