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app.py

@@ -330,9 +330,9 @@ STYLE = """
 #f3-root .canvas-wrap{background:var(--panel2);border:1px solid var(--line2);border-radius:14px;
   padding:22px;position:relative;min-height:560px;
   background-image:radial-gradient(var(--line) 1px,transparent 1px);background-size:17px 17px;}
-#f3-root .board{position:relative;margin:0 auto;background:#0b0b0e;border:1px solid #34343c;
+#f3-root .board{position:relative;margin:0 auto;background-color:#0b0b0e;border:1px solid #34343c;
   box-shadow:0 0 0 1px #000 inset; user-select:none; touch-action:none;}
-#f3-root .board.empty{background:#0b0b0e;}
+#f3-root .board.empty{background-color:#0b0b0e;}
 #f3-root .board img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;border-radius:1px;}
 #f3-root .ratio-tag{position:absolute;left:4px;bottom:-24px;color:var(--dim);font:12px/1 var(--mono);}
 #f3-root .board-tools{position:absolute;right:22px;bottom:22px;display:flex;gap:8px;align-items:center;z-index:30;}