body {
    margin: 0;
    background-color: #eee;
}

.full-width-banner {
    width: 100%;
    height: auto;
    display: block;
    text-align: center;
}

.full-width {
    width: 100%;
    height: auto;
}

.margin-top-10 {
    margin-top: 10px;
}

.margin-top-20 {
    margin-top: 20px;
}

.margin-20 {
    margin: 20px;
}

.padding-10 {
    padding: 10px;
}

.padding-top-20 {
    padding: 20px;
}

.padding-20 {
    padding: 20px;
}

.width-90 {
    width: 90%;
}

.width-50 {
    width: 40%;
    height: 40%;
}

.content {
    display: flex;
    flex-flow: column nowrap;
    justify-content: flex-start;
}

.left-right {
    background-color: #eee;
}

.left-right .fright {
    float: right;
}

.block {
    background-color: #eee;
    display: flex;
    flex-flow: row wrap;
    justify-content: space-around;
    align-content: center;
    padding-bottom: 20px;
}

footer {
    height: 0;
    margin-top: -30px;
    display: block;
    text-align: center;
    font-size: 12px;
    color: #aaa;
    font-family: '微软雅黑'
}
