a.external::after {
  content: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAAQElEQVR42qXKwQkAIAxDUUdxtO6/RBQkQZvSi8I/pL4BoGw/XPkh4XigPmsUgh0626AjRsgxHTkUThsG2T/sIlzdTsp52kSS1wAAAABJRU5ErkJggg==);
  margin: 0 3px 0 5px;
}

.btn-new-search {background-image: linear-gradient(to right, #DA22FF 0%, #9733EE  51%, #DA22FF  100%)}
.btn-new-search {
   transition: 0.5s;
   background-size: 200% auto;
   color: white;
   box-shadow: 0 0 20px #eee;
   display: block;
 }

 .btn-new-search:hover {
   background-position: right center; /* change the direction of the change here */
   color: #fff;
   text-decoration: none;
 }

.leaflet-tooltip {
  padding: 2px;
}

#vg-tooltip-element {
  z-index: 10000;
}