.flex-center {
    display: flex;
    align-items: center;
    justify-content: center
}

.wechat-step {
    margin-top: 10px
}

.wechat-step .step {
    color: #fff;
    background-color: #077cf4;
    border-radius: 50%;
    display: inline-block;
    width: 22px;
    height: 22px;
    text-align: center;
    margin-right: 5px;
    line-height: 22px
}

.wechat-step .stepline {
    display: inline-block;
    width: 30px;
    height: 1px;
    background-color: #999;
    margin-left: 4px;
    margin-right: 4px
}

.wechat-qrcode {
    position: relative;
    height: 300px;
    background-image: url(../images/loading-b.svg);
    background-repeat: no-repeat;
    background-position: center;
    background-size: 50px;
    z-index: 0
}

.wechat-qrcode::after {
    content: '';
    width: 198px;
    height: 198px;
    border: solid 1px #eee;
    z-index: -1
}

.qr-over, .wechat-qrcode::after {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    margin: auto
}

.qr-over {
    width: 200px;
    height: 200px;
    background-color: rgb(0 0 0 / 40%)
}

.qr-over div {
    background-color: rgb(255 255 255 / 80%);
    width: 100%;
    text-align: center;
    padding: 10px 0;
    color: #ff5722
}

 .theiaStickySidebar:after {
     content: "";
     display: table;
     clear: both;
 }