diff --git a/inst/rmarkdown/templates/revealjs_presentation/resources/default.html b/inst/rmarkdown/templates/revealjs_presentation/resources/default.html
index 5fd2a7f..8329c98 100644
--- a/inst/rmarkdown/templates/revealjs_presentation/resources/default.html
+++ b/inst/rmarkdown/templates/revealjs_presentation/resources/default.html
@@ -99,6 +99,16 @@
 $endif$
 
   </style>
+  
+  <!-- for leaflet -->
+  <style type="text/css">
+    .reveal .leaflet-container img {
+    max-height: none !important;
+    border: none;
+    box-shadow: none;
+    }
+  </style>
+
 
     <style type="text/css">code{white-space: pre;}</style>