.logo {
    display: block;
    width: 100px;
    height: 100px;
    margin: 80px auto 0px;
    border-radius: 10px;
}

p {
    padding: 0px 20%;
    color: black;
    font-size: 14px;
}

.title {
    font-size: 14px;
    text-align: center;
    margin-bottom: 30px;
}

.intro {
    margin-bottom: 10px;
    line-height: 22px;
    text-indent: 30px;
}

.tips {
    color: red; 
    font-size: 12px;
    margin-bottom: 20px;
}

.codeList {
    width: 350px;
    margin: 30px auto 30px;
}

.codeListItem {
    display: inline-block;
    width: 170px;
    text-align: center;
    font-size: 14px;
}

.codeListItem img {
    width: 150px;
    height: 150px;
}

.bottom {
    height: 50px;
    background: black;
    color: white;
    line-height: 50px;
    text-align: center;
    font-size: 12px;
}