.viewport-wrapper {
  width: 100%;
  height: 100%; /* MUST have `height` to prevent resize infinite loop */
  position: relative;
  /* Prevent text selection on the entire viewport wrapper */
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.cornerstone-viewport-element {
  width: 100%;
  height: 100%;
  position: relative;
  background-color: black;

  /* Prevent the blue outline in Chrome when a viewport is selected */
  outline: 0 !important;

  /* Prevents the entire page from getting larger
     when the magnify tool is near the sides/corners of the page */
  overflow: hidden;
  
  /* Prevent text selection on the viewport element */
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

/* Prevent text selection on overlay elements */
.noselect {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

/* Ensure all elements within viewport wrapper prevent text selection */
.viewport-wrapper * {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}