fix(css): added display block to all iframes to remove padding at bottom

Author: ritz078

dist/embed.min.css

@@ -26,21 +26,25 @@ $primary: #3498db;
     background-image: url(../assets/images/loader.svg);
     background-repeat: no-repeat;
     background-position: center;
-    width: 100%
+    width: 100%;
+    display: block;
 }
 
 .ejs-plunker iframe {
-    background-color: #fff
+    background-color: #fff;
+    display: block;
 }
 
 .ejs-jsbin iframe {
-    border: 1px solid #eee
+    border: 1px solid #eee;
+    display: block;
 }
 
 .ejs-vine iframe,
 .ejs-gist iframe {
     border: 0;
     margin: 10px 0;
+    display: block;
 }
 
 pre {
@@ -83,6 +87,7 @@ code {
 .ejs-video object {
     width: 100%;
     border: 0;
+    display: block;
 }
 
 .ejs-video video {
@@ -166,6 +171,7 @@ code {
 
 .ejs-video-player iframe {
     width: 100%;
+    display: block;
 }
 
 .ejs-image {