.enterprise-box{
    width: 1200px;
    max-width: 100%;
    display: block;
    margin: 0 auto;

}

.enterprise-title{
    font-size: 18px;
    color: #333333;
    text-align: center;
    display: block;
    letter-spacing: 2px;
    padding-top: 10px;
    padding-bottom: 30px;
}

.enterprise-logo-box{
    width: 100%;
    display: block;
    font-size: 0;
    margin-top: 20px;
}

.enterprise-logo-list{
    width: 360px;
    max-width: 100%;
    height: 360px;
    display: inline-block;
    position: relative;
    border: 1px solid #a0a0a0;
    box-sizing: border-box;
    border-radius: 10px;
    margin-bottom: 30px;
    vertical-align: top;
    overflow: hidden;
}

.enterprise-logo-box .enterprise-logo-list:nth-child(3n+2){
    margin: 0 60px;
}

.enterprise-logo{
    width: 100%;
    height: 100%;
    position: relative;
    z-index: 5;
  display: -webkit-flex;
  display:         flex;
  -webkit-align-items: center;
          align-items: center;
  -webkit-justify-content: center;
          justify-content: center;
        overflow: hidden;
}

.enterprise-mask-box{
    width: 100%;
    height: 100%;
    display: block;
    opacity: 1;
    z-index: 6;
    transition: all .3s linear;
    position: absolute;
    background-color: rgba(0, 0, 0, 0.4);
    box-sizing: border-box;
    top: 0;
    left: 0;
}