add min iframe height (to fix view on android chrome browser)

sd-card/html/style.css

@@ -1,6 +1,7 @@
 body, html {
     width: 100%; 
     height: 100%; 
+    min-height: 800px;
     margin: 0px 0px 0px 2px; 
     padding: 0; 
     font-family: arial;
@@ -19,7 +20,7 @@ body, html {
     flex-grow: 1;
     margin: 5px 7px 4px 0px; 
     padding: 0; 
-    border: 2px solid black
+    border: 2px solid black;
 }
 
 h1 {