@media only screen and (max-device-width: 500px) {}

html,
body {
    margin: 0px;
    padding: 0px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    width: 640px;
    max-width: 640px;
    height: auto;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.logo {
    margin: 0rem auto;
    width: 640px;
    height: 3rem;
    background-color: #fff;
}

.logo img {
    width: 60%;
    height: 100%;
    margin-left: .1rem;
}

.banner {
    width: 100%;
    height: 12rem;
    background-size: cover;
    background-repeat: no-repeat;
    margin: 0rem auto;
}

.banner img {
    width: 100%;
    height: 100%;
}


/**底部公共区域**/

.bottom-area {
    width: 640px;
    height: 17rem;
    margin-top: 1rem;
    background-color: #000;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.b-title-area {
    width: 640px;
    height: auto;
    display: flex;
    flex-direction: row;
}

.b-left {
    width: 320px;
    height: auto;
    display: flex;
    flex-direction: column;
}

.b-left img {
    width: 280px;
    height: 2rem;
    margin: 1rem 0rem 0rem 1rem;
    background-size: contain;
}

.b-left-title {
    width: 280px;
    height: 1rem;
    margin: .8rem 0rem 0rem 1rem;
    font-size: .8rem;
    color: #fff;
}

.b-right {
    width: 280px;
    height: auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.b-right img {
    width: 6rem;
    height: 6rem;
    margin-left: 4rem;
}

.blank-line-common {
    width: 600px;
    height: 2px;
    background-color: #fff;
    margin: 1rem auto 0rem auto;
}

.b-b-msg {
    width: 600px;
    height: 1rem;
    margin: .4rem auto .2rem auto;
    text-align: left;
    font-size: .8rem;
    color: #fff;
}

.b-b-msg span {
    color: #0976dd;
}

/**网页变灰色**/
/* html {
    filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
    -webkit-filter: grayscale(100%);
} */