.hisbox {
    padding: 2.6rem .7rem 1rem;
    overflow: hidden;
}
.histxt {
    position: relative;
    width: 31%;
    float: left;
    margin-right: 3.5%;
    margin-bottom: .7rem;
    border-radius: .1rem;
    overflow: hidden;
    cursor: pointer;
}

.histxt:nth-child(3n) {
    margin-right: 0;
}

.hismb {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 1;
    top: 0;
    left: 0;
    background: rgba(1, 0, 37, .7);
    text-align: center;
    opacity: 0;
    -webkit-transition: 0.3s linear;
    -moz-transition: 0.3s linear;
    -ms-transition: 0.3s linear;
    -o-transition: 0.3s linear;
    transition: 0.3s linear;
}
.hismb img {
    width: .55rem;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -.275rem;
    margin-left: -.275rem;
}

.hisbox h5 {
    font-size: .5rem ;
    color: #222;
    margin-bottom: .7rem;
}

.histxt:hover .hismb {
    opacity: 1;
}

@media (max-width: 992px) {
    .hisbox {
        padding: 80px 20px 30px;
    }
    .hisbox>h5 {
        font-size: 20px;
        color: #222;
        margin-bottom: 20px;
    }
    .histxt {
        position: relative;
        width: 100%;
        float: left;
        margin-right: 0;
        margin-bottom: 20px;
        border-radius: .1rem;
        overflow: hidden;
        cursor: pointer;
    }
    .hismb>img {
        width: 30px;
        position: absolute;
        top: 50%;
        left: 50%;
        margin-top: -15px;
        margin-left: -15px;
    }
}