Things are a changing

src/content/.obsidian/plugins/data-files-editor/styles.css

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+/*
+
+This CSS file will be included with your plugin, and
+available in the app when your plugin is enabled.
+
+If your plugin does not need CSS, delete this file.
+
+*/
+
+.datafile-source-view.mod-cm6 .cm-gutters {
+	flex: 0 0 auto;
+	background-color: transparent;
+	color: var(--text-faint) !important;
+	border-right: none !important;
+	margin-inline-end: var(--file-folding-offset);
+	font-size: var(--font-ui-smaller);
+	z-index: 1;
+	font-variant: tabular-nums;
+}
+
+.cm-gutterElement.cm-activeLineGutter {
+	background-color: #aaeeff44;
+}