.mtk-infowindow {
   background: white;
   padding: 10px;
   color: #444;
   border: 1px solid #777;
   -webkit-border-radius: 4px;
   -moz-border-radius: 4px;
   border-radius: 4px;
   width: auto;
   min-width: 200px;
}

.mtk-infowindow-close {
   background: url(https://static.maptoolkit.net/images/close.png);
   position: absolute;
   width: 27px;
   height: 27px;
   top: -10px;
   right: -10px;
   cursor: pointer;
}

.mtk-infowindow a {
   color: #444;
}