html programming - removing a frame

Experts,

I want to remove an unwanted frame on an html page. When I hit F12 on my IE-11 browser and click on the two boxes, it brings me to these two files below.  How can I negate them from running? I don't want to completely remove it.



.NUI_ContentFrameHeader
{
  clear: both;
  float: top;
  width: 100%;
  height: 12px;
  margin: 10px 0 0 0;
  color: black;
  background: #F0F6FB url(/vpns/images/TrailBackground.gif) repeat-x bottom left;
  border-top: solid 1px #BBC6D6;
  overflow: auto;
  letter-spacing: 0;  
}
.NUI_ContentFrameContent {
      PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; VERTICAL-ALIGN: top; PADDING-TOP: 0px;
      font-size: 9pt;
      font-family: Arial;
      color: Black;