diff --git a/src/DevBanner.svelte b/src/DevBanner.svelte
new file mode 100644
index 0000000..46f2808
--- /dev/null
+++ b/src/DevBanner.svelte
@@ -0,0 +1,18 @@
+<div id="banner">DEVMODE</div>
+
+<style>
+	#banner {
+		width: 200px;
+		background: red;
+		color: #fff;
+		position: fixed;
+		text-align: center;
+		top: 25px;
+		line-height: 40px;
+		right: -50px;
+		left: auto;
+		-ms-transform: rotate(45deg);
+		-webkit-transform: rotate(45deg);
+		transform: rotate(45deg);
+	}
+</style>
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