html, body {
    height: 100%;
}

body {
    background: #f2f4f7;
}

.main_body {
    padding: 48px 0 72px;
    background: #f2f4f7;
}

.inner_body {
    display: flex;
    justify-content: center;
}

.content_box {
    width: 100%;
    max-width: 720px;
}

.qr-card {
    background: #fff;
    border-radius: 16px;
    padding: 36px 32px;
    border: 1px solid #e6e8eb;
    box-shadow: 0 18px 48px rgba(2, 6, 12, .08), 0 2px 8px rgba(2, 6, 12, .05);
    text-align: center;
    position: relative;
    overflow: hidden;
}

    .qr-card::before {
        content: "";
        position: absolute;
        left: 0;
        top: 0;
        right: 0;
        height: 4px;
        background: #5cc132;
    }

    .qr-card h2 {
        color: #1f2937;
        font-size: 22px;
        line-height: 1.45;
        font-weight: 600;
        margin: 4px 0 20px;
    }

.qr-code-container {
    margin: 18px auto 6px;
    padding: 20px;
    background: #fafbfc;
    border-radius: 12px;
    border: 1px solid #eef0f2;
    display: inline-block;
}

    .qr-code-container img,
    .qr-code-container canvas {
        width: 300px;
        height: 300px;
        max-width: 100%;
        display: block;
    }

.qr-footer-text {
    text-align: center;
    margin-top: 18px;
    color: #252c82;
    font-size: 1.2em;
    bottom: 0;
}

@media (max-width: 640px) {
    .main_body {
        padding: 28px 0 56px;
    }

    .qr-card {
        padding: 28px 22px;
        border-radius: 14px;
    }

        .qr-card h2 {
            font-size: 18px;
        }
}