.tjnj-list{margin-left: -2%;}
.tjnj-list li{
   width: 31.33%;
   margin-left: 2%;
   float: left;
   margin-top: 30px;
}
.rqtb {
    padding: 60px 0px;
    float: left;
    width: 300px;
    height: 100px;
    background-color: rgb(245, 246, 247);
    text-align: center;
    font-size: 20px;
    font-weight: bold;
}
.rqtb span {line-height: 70px;}

@media screen and (max-width: 1000px){
    .tjnj-list li{margin-top: 20px;}
    .rqtb{font-size: 18px;}

}
@media screen and (max-width: 750px){
    .tjnj-list li{width: 48%;}
    .rqtb{padding: 30px 0;}

}
@media screen and (max-width: 400px){
    .tjnj-list li{width: auto;float: none}
}