diff --git a/package.json b/package.json
index 826491a..ac28c4d 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,9 @@
     "markdown.previewScripts": [
       "./page.bundle.js"
     ],
+    "markdown.previewStyles": [
+      "./page.css"
+    ],
     "markdown.markdownItPlugins": true
   },
   "dependencies": {
diff --git a/page.css b/page.css
new file mode 100644
index 0000000..69ef118
--- /dev/null
+++ b/page.css
@@ -0,0 +1,3 @@
+.mermaid > svg {
+  height: auto;
+}