Code

<iframe src="/frames/top.html" name="title" width="100%" style="height: 15vh; border: 1px solid #b5e853;"></iframe>
<iframe src="/frames/main.html" name="main" width="100%" style="height: 75vh; border: 2px solid #b5e853;"></iframe>
<iframe src="/frames/bottom.html" name="bottom" width="100%" style="height: 10vh; border: 1px solid #b5e853;"></iframe>