diff --git a/src/codeMirror6Scroller.ts b/src/codeMirror6Scroller.ts
index b7bb94f..b681f7a 100644
--- a/src/codeMirror6Scroller.ts
+++ b/src/codeMirror6Scroller.ts
@@ -13,15 +13,15 @@ export default (context: ContentScriptContext): MarkdownEditorContentScriptModul
         console.log('scrollToLine', lineNumber);
 
         // Bounds checking
-        if (lineNumber < 1) {
-          lineNumber = 1;
+        if (lineNumber < 0) {
+          lineNumber = 0;
         }
-        if (lineNumber > editor.state.doc.lines) {
-          lineNumber = editor.state.doc.lines;
+        if (lineNumber >= editor.state.doc.lines) {
+          lineNumber = editor.state.doc.lines - 1;
         }
 
         // Scroll to line, place the line at the *top* of the editor
-        const lineInfo = editor.state.doc.line(lineNumber);
+        const lineInfo = editor.state.doc.line(lineNumber + 1);
         editor.dispatch(editor.state.update({
           effects: EditorView.scrollIntoView(lineInfo.from, {y: 'start'})
         }));
diff --git a/src/webview.js b/src/webview.js
index bc4012f..08df6cd 100644
--- a/src/webview.js
+++ b/src/webview.js
@@ -33,7 +33,7 @@ function copyInnerLink(dataset, text) {
 function scrollToTop() {
   webviewApi.postMessage({
     name: 'scrollToHeader',
-    lineno: 1,
+    lineno: 0,
     hash: 'rendered-md',
   });
 }