Fix auto scroll bug

Fixes #18362

src/vs/workbench/parts/terminal/electron-browser/media/terminal.css

@@ -38,10 +38,11 @@
 }
 
 .monaco-workbench .panel.integrated-terminal .xterm-viewport {
-	/* Subtract right margin so that the scroll bar aligns with size of panel */
-	margin-right: -20px;
-	/* Force 100% height so that the scroll bar is aligned to the top and the bottom of the panel, the terminal rows may not be top aligned */
-	height: 100% !important;
+	/* Align the viewport to the bottom of the panel, just like the terminal */
+	position: absolute;
+	right: 0;
+	bottom: 0;
+	left: 0;
 }
 
 /* Terminal actions */