Hydrocarbon Structure

div style="position: relative; width: 100%; height: 600px;">

    <!-- Iframe -->
<iframe 
    id="myIframe"
    src="https://rupeshsinghbohara.com.np/wp-content/uploads/2026/05/10-Science-Hydrocarbon-and-Structure-training-file-by-Rupesh-Bohara.htm"
    width="100%" 
    height="100%" 
    style="border:none;"
    allow="fullscreen">
</iframe>

<!-- Bottom Center Fullscreen Button -->
<button onclick="toggleFullscreen()" 
    style="
        position: absolute;
        bottom: 15px;
        left: 50%;
        transform: translateX(-50%);
        padding: 10px 16px;
        background: rgba(0,0,0,0.7);
        color: white;
        border: none;
        border-radius: 6px;
        cursor: pointer;
        z-index: 10;
    ">
    ⛶ Full Screen
</button>