网页自适应，文字广告，广告位代码

/**新增文字广告**/
.txtguanggao {
    margin: 10px 0 -3px;
    width: calc(100% + 3px);
    overflow: hidden;
}

.txtguanggao a {
    margin: 0 3px 3px 0;
    width: calc(25% - 3px);
    float: left;
    line-height: 32px;
    height: 32px;
    text-align: center;
    color: #fff;
}

.txtguanggao a:nth-child(1) {
    background-color: #dc3545;
}

.txtguanggao a:nth-child(2) {
    background-color: #007bff;
}

.txtguanggao a:nth-child(3) {
    background-color: #28a745;
}

.txtguanggao a:nth-child(4) {
    background-color: #ffc107;
}

.txtguanggao a:nth-child(5) {
    background-color: #28a745;
}

.txtguanggao a:nth-child(6) {
    background-color: #ffc107;
}

.txtguanggao a:nth-child(7) {
    background-color: #dc3545;
}

.txtguanggao a:nth-child(8) {
    background-color: #007bff;
}

.txtguanggao a:hover {
    background: #FF2805;
    color: #FFF
}

@media screen and (max-width: 768px) {
    .txtguanggao a {
        width: calc(50% - 3px);
    }
}