.prevent_selection {
  -webkit-user-select: none;
     -moz-user-select: -moz-none;
      -ms-user-select: none;
          user-select: none;
}

.selector {   
    display: none;
    position: absolute;    
    border: 1px solid #3399FF;
    background-color: rgba(51,153,255, 0.2);
    z-index: 1000;
}