.wpdf-viewer {
    width: 100%;
    margin: 30px 0;
    padding: 0;
    display: block;
    box-sizing: border-box;
}

.wpdf-viewer iframe {
    display: block;
    width: 100% !important;
    max-width: 100% !important;
    height: 700px !important;
    border-radius: 8px !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08) !important;
    border: none !important;
}

.lesson .wpdf-viewer,
.learndash-wrapper .wpdf-viewer {
    width: 100%;
}

.wpdf-viewer + .wpdf-viewer {
    margin-top: 20px;
}

@media (max-width: 768px) {
    .wpdf-viewer iframe {
        height: 500px !important;
    }
}