#wall {
    width: calc(100vw - 30px);
    margin: 0 auto;
    text-align: center;
}
#wall .item {
    display: inline-block;
    width: 320px;
    padding: 15px;
    margin: 15px;
    vertical-align: top;
    z-index: 1;
    text-align: left;
}