diff --git a/src/Theme/Colors/index.ts b/src/Theme/Colors/index.ts
index 2fd255b..fdfa75d 100644
--- a/src/Theme/Colors/index.ts
+++ b/src/Theme/Colors/index.ts
@@ -1,20 +1,33 @@
 import { countDecimals } from "Utils";
 import { fromString } from "css-color-converter";
 
+export interface ColorsInput {
+  [key: string]: string;
+}
+
+export interface ShadesOptions {
+  keys?: string[];
+  keyPrefix?: string;
+  keySuffix?: string;
+  opacities?: number[];
+  structure?: "flat" | "nested";
+  format?: "default" | "css-variable";
+}
+
 const DEFAULT_OPACITIES = [0.1, 0.25, 0.5, 0.75];
 const DEFAULT_STRUCTURE = "flat";
 
 const formatColor = ({
-  prefix,
+  key,
   rgb,
   opacity,
 }: {
-  prefix?: string;
+  key?: string;
   rgb: string;
   opacity?: number;
 }) => {
   return {
-    [`${prefix ? prefix + "-" : ""}${
+    [`${key ? key + "-" : ""}${
       opacity !== undefined
         ? countDecimals(opacity) === 1
           ? (opacity + "").split(".")[1] + "0"
@@ -24,16 +37,7 @@ const formatColor = ({
   };
 };
 
-const generateShades = (
-  colors: { [key: string]: string },
-  options?: {
-    keys?: string[];
-    keyPrefix?: string;
-    opacities?: number[];
-    structure?: "flat" | "nested";
-    format?: "default" | "css-variable";
-  }
-) => {
+const generateShades = (colors: ColorsInput, options?: ShadesOptions) => {
   const colorKeys = options?.keys
     ? Object.keys(colors).filter((key) => options.keys?.includes(key))
     : Object.keys(colors);
@@ -47,7 +51,7 @@ const generateShades = (
   const generatedColorShadesArr: object[] = [];
 
   colorKeys.forEach((_key) => {
-    const key = (options?.keyPrefix || "") + _key;
+    const key = (options?.keyPrefix || "") + _key + (options?.keySuffix || "");
     const colorString = colors[_key];
 
     const opacities = options?.opacities
@@ -57,9 +61,7 @@ const generateShades = (
     if (structure === "flat") {
       opacities.forEach((opacity) => {
         const rgba = fromString(colorString).toRgbaArray();
-        generatedColorShadesArr.push(
-          formatColor({ prefix: key, rgb: rgba, opacity })
-        );
+        generatedColorShadesArr.push(formatColor({ key, rgb: rgba, opacity }));
       });
     } else {
       generatedColorShadesArr.push({
diff --git a/src/Theme/index.test.ts b/src/Theme/index.test.ts
new file mode 100644
index 0000000..54cb9ff
--- /dev/null
+++ b/src/Theme/index.test.ts
@@ -0,0 +1,74 @@
+import {
+  generateThemeOverrideClass,
+  generateThemeRoot,
+  generateTheme,
+  ThemeInput,
+} from ".";
+
+const exampleProperties = {
+  "color-main-10": "black",
+  "color-main-50": "grey",
+};
+
+const exampleThemes: ThemeInput[] = [
+  {
+    name: "default",
+    colors: { "color-main": "black" },
+  },
+  {
+    name: "dark",
+    colors: { "color-main": "white", "color-secondary": "blue" },
+  },
+  { name: "light", colors: { "color-secondary": "grey" } },
+];
+
+test("it generates css based on input properties", () => {
+  const themeClass = generateThemeOverrideClass({
+    properties: exampleProperties,
+    className: "dark-theme",
+  });
+
+  expect(themeClass).toBeDefined();
+});
+
+test("no input so it returns empty string", () => {
+  const themeClass = generateThemeOverrideClass({
+    properties: {},
+    className: "dark-theme",
+  });
+
+  expect(themeClass).toBeDefined();
+  expect(themeClass).toEqual("");
+});
+
+test("it generates the theme root", () => {
+  const themeRoot = generateThemeRoot({ properties: exampleProperties });
+  console.log(themeRoot);
+  expect(themeRoot).toBeDefined();
+});
+
+test("it generates the complete theme with overrides", () => {
+  const theme = generateTheme({
+    themes: exampleThemes,
+    output: "CSS",
+  });
+
+  console.log(theme);
+
+  expect(theme).toBeDefined();
+});
+
+test("it generates the complete theme with overrides and color shades", () => {
+  const theme = generateTheme({
+    themes: exampleThemes,
+    output: "CSS",
+    generateColorShades: {
+      structure: "flat",
+      format: "css-variable",
+    },
+  });
+
+  console.log(theme);
+
+  expect(theme).toBeDefined();
+});
diff --git a/src/Theme/index.ts b/src/Theme/index.ts
index 7b2d6b8..8b161ce 100644
--- a/src/Theme/index.ts
+++ b/src/Theme/index.ts
@@ -1,3 +1,85 @@
 import * as Colors from "./Colors";
+import { generateShades, ColorsInput, ShadesOptions } from "./Colors";
 
-export default { Colors };
+export interface ThemeInput {
+  name: string;
+  colors: ColorsInput;
+}
+
+const generateThemeOverrideClass = (input: {
+  properties: any;
+  className: string;
+}) => {
+  const propKeys = Object.keys(input.properties);
+
+  if (propKeys.length > 0) {
+    return ` 
+    .${input.className} {${propKeys
+      .map((key) => `\t--${key}: ${input.properties[key]};`)
+      .join("\n")}}`;
+  } else return "";
+};
+
+const generateThemeRoot = (input: { properties: any }) => {
+  const propKeys = Object.keys(input.properties);
+
+  if (propKeys.length > 0) {
+    return `
+    :root {${propKeys
+      .map((key) => `\t--${key}: ${input.properties[key]};`)
+      .join("\n")}}`;
+  } else return "";
+};
+
+const generateTheme = (options: {
+  output?: "CSS";
+  themes: ThemeInput[];
+  generateColorShades?: boolean | ShadesOptions;
+}) => {
+  if (
+    options.generateColorShades !== undefined &&
+    options.generateColorShades !== false
+  ) {
+    options.themes = options.themes.map((theme) => {
+      theme.colors = {
+        ...generateShades(
+          theme.colors,
+          typeof options.generateColorShades !== "boolean"
+            ? options.generateColorShades
+            : undefined
+        ),
+        ...theme.colors,
+      };
+
+      return theme;
+    });
+  }
+
+  const themeRoot = generateThemeRoot({
+    properties: { ...options.themes[0].colors },
+  });
+
+  if (options.themes.length > 1) {
+    const themeOverrides = options.themes
+      .slice(1)
+      .map((theme) => {
+        const overrideClass = generateThemeOverrideClass({
+          properties: { ...theme.colors },
+          className: theme.name,
+        });
+
+        return overrideClass;
+      })
+      .join("\n");
+
+    return themeRoot + themeOverrides;
+  } else return themeRoot;
+};
+
+export { generateThemeOverrideClass, generateThemeRoot, generateTheme };
+export default {
+  Colors,
+  generateThemeOverrideClass,
+  generateThemeRoot,
+  generateTheme,
+};