.hot:first-child {
    position: relative;
}

.hot::after {
    position: absolute;
    content: "";
    top: 50%;
    transform: translateY(-50%);
    text-align: left;
    width: 0.42rem;
    height: 0.28rem;
    margin-left: 0.1rem;
    background-size: 0.42rem 0.28rem !important;
    background: url(../images/hot.png) center no-repeat;
}