diff --git a/h2i.html b/h2i.html
index df1a84b..f61dafd 100644
--- a/h2i.html
+++ b/h2i.html
@@ -92,7 +92,7 @@
         /* darkmode */
         @media (prefers-color-scheme: dark) {
             :root {
-                --bg: #000000;
+                --bg: #000000 !important;
             }
         }
     </style>
@@ -155,7 +155,11 @@
 
             ctx.font = fsize.value + "px heonian";
             ctx.fillText(hinput.value, 0, fsize.value);
-            cropToContent();
+            if (hinput.value.length > 0) {
+                cropToContent();
+            } else {
+                img.src = '';
+            }
         }
 
         let ime = new HeonianIME(hinput);