#iframe-wrap {

position: fixed;

top: 100px;

bottom: 0px;

left: 0px;

right: 0px;

-webkit-overflow-scrolling: touch;

overflow-y: scroll;

}

#iframe-wrap iframe {

border: none;

width: 100%;

height: 101%;

}

 

<div id="iframe-wrap">

<iframe src="">

</iframe>

</div>