body {
    margin: 0 15px 15px 15px;
}

#main-box {
    width: 100%;
    height: 100%;
    background-color: #fff;
    border-radius: 5px;
}

#basic-box {
    width: 100%;
    height: calc(100% - 120px);
    flex-direction: column;
    justify-content: space-evenly;
}


#operBox,
#qrCodeBox {
    width: 100%;
    height: 25%;
    flex-direction: column;
    justify-content: space-evenly;
}

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

.btn-box {
    width: 100%;
    height: 80px;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
}