body, html {
    margin: 0;
    padding: 0;
    height: 100%;
}
.mian{
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #FFFFFF;
    background-color: #f5f5f5;
    font-weight: 400;
}
.body{
    display: flex;
    align-items: center;
    /* justify-content: center; */
    justify-content: flex-start;
    flex-direction: column;
    width: 480px;
    margin: 0 auto;
    height: 100vh;
    background-color: rgb(38, 38, 36);
}

@media (min-width: 480px) {
    body {
        width: 100%;
        background-color: lightblue; /* 手机背景色示例 */
    }
}

.banner{
    width: 80%;
    margin-top: 10%;
    margin-left: 10%;
}

.btn{
    margin-top: 30px;
    width: 60%;
    height: 50px;
    background: linear-gradient(30deg, rgb(255, 206, 116) 0%, rgb(255, 187, 102) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 20px;
    color: rgb(43, 42, 38);
    font-weight: 500;
}
.btn:active{
    transform: scale(0.9);
}
.mark{
    margin-top: 50px;
    margin-bottom: 20px;
}