.svg-viewer.container {
   -moz-user-select: -moz-none;
   -khtml-user-select: none;
   -webkit-user-select: none;

   /*
     Introduced in IE 10.
     See http://ie.microsoft.com/testdrive/HTML5/msUserSelect/
   */
   -ms-user-select: none;
   user-select: none;
}

.svg-viewer.container .toolbar {
  position: absolute;
  text-align: center;
}

.svg-viewer.container .toolbar .button {
  display: inline-block;
  background: transparent;
  padding: 0;
  margin: 0;
  line-height: 0;
  border: 1px solid transparent;
  cursor: pointer;
}

.svg-viewer.container .toolbar .button:hover {
  border: 1px solid lightgray;
}