@media (max-width: 834px) {
    .box3 .inner:after {
        content: '';
        display: block;
        position: absolute;
        bottom: -90px;
        border-width: 70px 332px 0 332px;
        border-style: solid;
        border-color: #FFBA0E transparent transparent;
        left: 70px;
    }
    .box4 .txt{
        margin-bottom: 50px;
    }
}