Check this stackoverflow thread.
Refused to display 'http://www.secure-booker.com/nail/MakeAppointment/Search.aspx' in a frame because an ancestor violates the following Content Security Policy directive: "frame-ancestors 'self' http://www.nailstudioboulder.com http://*.nailstudioboulder.com nailstudioboulder.com *.nailstudioboulder.com".
Mixed Content: The page at 'https://sites.google.com/a/greenvilleschools.us/mrs-hovis-class/' was loaded over HTTPS, but requested an insecure resource 'http://aimeehovis.wix.com/firsties#!home/mainPage'. This content should also be served over HTTPS.
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Finally after many investigations and searches the below code solve the issue:
<style type="text/css">
iframe {
border: none;
width: 100%;
height: 500px;
}
@media (min-width: 1024px) {
.content_viewport {
border: 0px none;
height: 900px;
width: 100%;
}
}
@media (max-width: 1023px) {
.content_viewport {
border: 0px none;
height: 900px;
width: 100%; }
}
@media (min-width: 768px) {
.content_viewport {
border: 0px none;
height: 900px;
width: 100%; }
}
</style>
<div style=" overflow: hidden; margin: 15px auto; max-width: 880px;"><iframe class="content_viewport" scrolling="no" src="<Your URL>"></iframe>
<p> </p>
</div>