index.css

* {
 -webkit-touch-callout: none; /* iOS Safari */
   -webkit-user-select: none; /* Safari */
    -khtml-user-select: none; /* Konqueror HTML */
      -moz-user-select: none; /* Old versions of Firefox */
       -ms-user-select: none; /* Internet Explorer/Edge */
           user-select: none; /* Non-prefixed version, currently
                                 supported by Chrome, Edge, Opera and Firefox */
}
html, body{
 overflow: hidden;
 height:100%;
}
iframeDiv, iframe{
 position: absolute;
 width: 100%;
 height:100%;
 left:0px;
 top:0px;
 border: 0px solid transparent;
 pointer-events: none;
}
a.bookmarlet{
 cursor: move; /* fallback if grab cursor is unsupported */
 cursor: grab;
 cursor: -moz-grab;
 cursor: -webkit-grab;
 
 margin: 0;
 position: absolute;
 top: 50%;
 left: 50%;
 transform: translate(-50%, -50%); 
}
a.bookmarlet span{
 display:none;
}

a.bookmarlet:before{
  display:inline-block;
  content: "☰ Przeciągnij mnie na pasek zakładek";
  padding:20px;
}