✨ Added custom color for buttons

frontend/src/lib/helpers.ts

@@ -0,0 +1,16 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+export const invertColor = (hexTripletColor: string): string => {
+	let color = hexTripletColor;
+	color = color.substring(1); // remove #
+	let color_int = parseInt(color, 16); // convert to integer
+	color_int = 0xffffff ^ color_int; // invert three bytes
+	color = color_int.toString(16); // convert to hex
+	color = ('000000' + color).slice(-6); // pad with leading zeros
+	color = '#' + color; // prepend #
+	return color;
+};