html,
body {
    width: 100%;
    height: 100%;
    margin: 0px;
}

.introduce {
    width: 50%;
}

.introduce_title {
    font-size: 40px;
    font-weight: bold;
}

.introduce_desc {
    font-size: medium;
    color: #333333;
}

.logo {
    width: 15vh;
    height: 15vh;
}

.top_background {
    width: 100%;
    height: 30%;
    background-image: url('https://oss.joygem.net/img/joyaudio/img/background.png');
    background-size: cover;
    background-repeat: no-repeat;
    background-position: inherit;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.bottom_background {
    width: 100%;
    height: 40%;
    background-image: url('https://oss.joygem.net/img/joyaudio/img/background2.png');
    background-size: cover;
    background-repeat: no-repeat;
    display: flex;
    justify-content: center;
    align-items: center;
}

.center_view {
    width: 100%;
    height: 30%;
    display: flex;
    justify-content: space-around;
    align-items: center;
}


.qrcode_ios {
    height: 15vh;
    width: 10vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

#ios_download .image {
    border: none;
    border-radius: 10px;
    background-color: black;
    padding-top: 5%;
    padding-bottom: 5%;
    padding-left: 5%;
    padding-right: 5%;
    width: 100%;
    height: auto;
}

#ios_download .desc {
    width: 100%;
    height: 100%;
    color: black;
    place-items: center;
    display: grid;
}

.qrcode_android {
    height: 15vh;
    width: 10vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

#and_download .image {
    border: none;
    border-radius: 10px;
    background-color: black;
    padding-top: 5%;
    padding-bottom: 5%;
    padding-left: 5%;
    padding-right: 5%;
    width: 100%;
    height: auto;
}

#and_download .desc {
    width: 100%;
    height: 100%;
    color: black;
    place-items: center;
    display: grid;
}