.jiaoji{
    width: 1200px;
    margin: 0 auto;
    padding: 50px 0px 0px 0px;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    grid-gap: 1em;
}

.jiaoji div{
    margin: 0 auto;
}
.jiaoji div img{
    max-width: 286px;
}