diff --git a/src/assets/style/variable.less b/src/assets/style/variable.less
index 33614ff..ca95eb7 100644
--- a/src/assets/style/variable.less
+++ b/src/assets/style/variable.less
@@ -24,6 +24,7 @@
 	--tui-shadow: 3px 3px 0 var(--tui-shadow-color);
 	--tui-bezier: cubic-bezier(.19, .1, .22, 1);
 	--tui-shadow-color: rgba(0, 0, 0, .2);
+	--tui-radius-default: 0;
 
 	each(@tuiColors, {
 		--tui-@{key}: @value;
diff --git a/src/components/prism-code-block.less b/src/components/prism-code-block.less
index 944793d..5194f34 100644
--- a/src/components/prism-code-block.less
+++ b/src/components/prism-code-block.less
@@ -18,13 +18,13 @@
 	iframe.tp-iframe {
 		width: min(100%, 56rem);
 		overflow: hidden;
-		border-radius: var(--tui-radius-default, .375rem);
-		background: var(--tui-bg-color-container, #fff);
-		border: 1px solid var(--tui-component-border, #dcdcdc);
 	}
 
 	iframe.tp-iframe {
 		height: 28rem;
+		border: 1px solid var(--tui-component-border, #dcdcdc);
+		background: var(--tui-bg-color-container, #fff);
+		border-radius: var(--tui-radius-default, .375rem);
 	}
 
 	table {