Block Auto-size for iframe?

[victor.back]

Hi. 
Is there possible to block the auto-size setting for iframes in visualisation, tried using some additional CSS an additional classes but no success.

Code:

.iframeSpotRing {
  height: 670px;               
  overflow-y: auto;            /* for adding scrollbar if conent more then 670px */
  transform: none !important;  /* block autosize */
  width: 100% !important;     
  pointer-events: all !important;
}