diff --git a/__tests__/CodeView-test.js b/__tests__/CodeView-test.js
new file mode 100644
index 0000000..9a0250f
--- /dev/null
+++ b/__tests__/CodeView-test.js
@@ -0,0 +1,53 @@
+import React from 'react';
+import { render, screen } from '@testing-library/react';
+import CodeView from '../src/CodeView';
+import MarkdownRenderer from '../src/MarkdownRenderer';
+
+// Mock the MarkdownRenderer component
+jest.mock('../src/MarkdownRenderer', () => 
+  jest.fn(({ children }) => (
+    <div data-testid="mock-markdown-renderer">{children}</div>
+  ))
+);
+
+describe('CodeView', () => {
+  it('renders without crashing', () => {
+    render(<CodeView sourceCode="const a = 1;" />);
+    expect(screen.getByTestId('mock-markdown-renderer')).toBeInTheDocument();
+  });
+
+  it('passes copyButtonProps to MarkdownRenderer', () => {
+    const mockCopyButtonProps = {
+      'data-testid': 'custom-copy-btn',
+      className: 'custom-class',
+    };
+
+    render(
+      <CodeView 
+        sourceCode="const a = 1;" 
+        copyButtonProps={mockCopyButtonProps} 
+      />
+    );
+
+    // Check if MarkdownRenderer was called with the correct props
+    expect(MarkdownRenderer).toHaveBeenCalledWith(
+      expect.objectContaining({
+        copyButtonProps: mockCopyButtonProps
+      }),
+      expect.anything()
+    );
+  });
+
+  it('passes sourceCode to Renderer', () => {
+    const sourceCode = 'const a = 1;';
+    render(<CodeView sourceCode={sourceCode} />);
+    
+    // Check if the source code is passed down to the MarkdownRenderer
+    expect(MarkdownRenderer).toHaveBeenCalledWith(
+      expect.objectContaining({
+        children: sourceCode
+      }),
+      expect.anything()
+    );
+  });
+});
diff --git a/__tests__/MarkdownRenderer-test.js b/__tests__/MarkdownRenderer-test.js
new file mode 100644
index 0000000..0a45171
--- /dev/null
+++ b/__tests__/MarkdownRenderer-test.js
@@ -0,0 +1,152 @@
+import React from 'react';
+import { render, screen, fireEvent } from '@testing-library/react';
+import copy from 'copy-to-clipboard';
+import MarkdownRenderer from '../src/MarkdownRenderer';
+
+// Mock the copy-to-clipboard library
+jest.mock('copy-to-clipboard');
+
+// Mock document.execCommand which is used as a fallback
+beforeEach(() => {
+  document.execCommand = jest.fn();
+  document.createRange = () => ({
+    setStart: () => true,
+    setEnd: () => true,
+    commonAncestorContainer: {
+      nodeName: 'BODY',
+      ownerDocument: document,
+    },
+  });
+  window.getSelection = () => ({
+    removeAllRanges: () => undefined,
+    addRange: () => undefined,
+    toString: () => '',
+  });
+
+  // Mock the clipboard API
+  Object.defineProperty(navigator, 'clipboard', {
+    value: {
+      writeText: jest.fn().mockResolvedValue(undefined),
+    },
+    writable: true,
+    configurable: true,
+  });
+
+  // Reset all mocks
+  jest.clearAllMocks();
+});
+
+afterEach(() => {
+  jest.clearAllMocks();
+  jest.restoreAllMocks();
+});
+
+describe('MarkdownRenderer', () => {
+  it('renders without crashing', () => {
+    render(<MarkdownRenderer>{'<h2>Test</h2>'}</MarkdownRenderer>);
+    expect(screen.getByText('Test').tagName).toBe('H2');
+  });
+
+  it('renders code blocks with copy button', () => {
+    const { container } = render(
+      <MarkdownRenderer>
+        {`<div class="rcv-code-renderer"><pre><code>const a = 1;</code></pre></div>`}
+      </MarkdownRenderer>
+    );
+
+    const codeBlock = container.querySelector('.rcv-code-renderer');
+    expect(codeBlock).toBeInTheDocument();
+
+    // Check if copy button is rendered with the correct class
+    const copyButton = container.querySelector('button[title="Copy code"]');
+    expect(copyButton).toBeInTheDocument();
+    expect(copyButton).toHaveClass('btn-copy-code');
+  });
+
+  it('applies custom copy button props', () => {
+    const customProps = {
+      'data-testid': 'custom-copy-button',
+      class: 'custom-button-class',
+      onClick: jest.fn(),
+    };
+
+    const { container } = render(
+      <MarkdownRenderer copyButtonProps={customProps}>
+        {`<div class="rcv-code-renderer"><pre><code>const a = 1;</code></pre></div>`}
+      </MarkdownRenderer>
+    );
+
+    const copyButton = container.querySelector('button[title="Copy code"]');
+    expect(copyButton).toHaveAttribute('data-testid', 'custom-copy-button');
+    expect(copyButton.getAttribute('class')).toEqual('custom-button-class');
+    expect(copyButton.getAttribute('data-testid')).toEqual('custom-copy-button');
+  });
+
+  it('copies code to clipboard when copy button is clicked', () => {
+    const { container } = render(
+      <MarkdownRenderer>
+        {`<div class="rcv-code-renderer"><pre><code>const test = 'test';</code></pre></div>`}
+      </MarkdownRenderer>
+    );
+
+    const copyButton = container.querySelector('button[title="Copy code"]');
+    fireEvent.click(copyButton);
+
+    // Check if copy-to-clipboard was called with the correct code
+    expect(copy).toHaveBeenCalledWith('const test = \'test\';');
+  });
+
+  it('copies code using copy-to-clipboard', () => {
+    const { container } = render(
+      <MarkdownRenderer>
+        {`<div class="rcv-code-renderer"><pre><code>const test = 'test';</code></pre></div>`}
+      </MarkdownRenderer>
+    );
+
+    const copyButton = container.querySelector('button[title="Copy code"]');
+    fireEvent.click(copyButton);
+
+    // Verify copy was called with the correct text (including the semicolon)
+    expect(copy).toHaveBeenCalledWith('const test = \'test\';');
+    
+    // Verify the copy button exists and has the correct title
+    expect(copyButton).toBeInTheDocument();
+    expect(copyButton).toHaveAttribute('title', 'Copy code');
+    
+    // Verify the copy function was called with the correct text
+    expect(copy).toHaveBeenCalledWith('const test = \'test\';');
+  });
+
+  it('adds copy button by default', () => {
+    const { container } = render(
+      <MarkdownRenderer>
+        {`<div class="rcv-code-renderer"><pre><code>with copy</code></pre></div>`}
+      </MarkdownRenderer>
+    );
+
+    const copyButton = container.querySelector('button[title="Copy code"]');
+    expect(copyButton).toBeInTheDocument();
+  });
+
+  it('handles multiple code blocks', () => {
+    const { container } = render(
+      <MarkdownRenderer>
+        {`
+          <div class="rcv-code-renderer"><pre><code>first block</code></pre></div>
+          <div class="rcv-code-renderer"><pre><code>second block</code></pre></div>
+        `}
+      </MarkdownRenderer>
+    );
+
+    const copyButtons = container.querySelectorAll('button[title="Copy code"]');
+    expect(copyButtons).toHaveLength(2);
+    
+    // Test first button
+    fireEvent.click(copyButtons[0]);
+    expect(copy).toHaveBeenCalledWith('first block');
+    
+    // Test second button
+    fireEvent.click(copyButtons[1]);
+    expect(copy).toHaveBeenCalledWith('second block');
+  });
+});
diff --git a/src/CodeView.tsx b/src/CodeView.tsx
index fd26b8f..588fec3 100644
--- a/src/CodeView.tsx
+++ b/src/CodeView.tsx
@@ -1,4 +1,3 @@
-/* eslint-disable @typescript-eslint/no-var-requires */
 import React from 'react';
 import MarkdownRenderer from './MarkdownRenderer';
 import parseHTML from './utils/parseHTML';
@@ -10,6 +9,9 @@ export interface CodeViewProps extends RendererProps {
 
   /** The code to be rendered is executed */
   sourceCode?: string;
+
+  /** The properties of the copy button */
+  copyButtonProps?: React.HTMLAttributes<HTMLButtonElement>;
 }
 
 const CodeView = React.forwardRef((props: CodeViewProps, ref: React.Ref<HTMLDivElement>) => {
@@ -21,6 +23,7 @@ const CodeView = React.forwardRef((props: CodeViewProps, ref: React.Ref<HTMLDivE
     theme = 'light',
     editable,
     transformOptions,
+    copyButtonProps,
     renderToolbar,
     onChange,
     beforeCompile,
@@ -57,7 +60,11 @@ const CodeView = React.forwardRef((props: CodeViewProps, ref: React.Ref<HTMLDivE
             />
           );
         } else if (fragment.type === 'html') {
-          return <MarkdownRenderer key={fragment.key}>{fragment.content}</MarkdownRenderer>;
+          return (
+            <MarkdownRenderer key={fragment.key} copyButtonProps={copyButtonProps}>
+              {fragment.content}
+            </MarkdownRenderer>
+          );
         }
       })}
     </div>
diff --git a/src/MarkdownRenderer.tsx b/src/MarkdownRenderer.tsx
index c05f4f9..3c4e6a0 100644
--- a/src/MarkdownRenderer.tsx
+++ b/src/MarkdownRenderer.tsx
@@ -7,18 +7,22 @@ import { iconPath as checkPath } from './icons/Check';
 
 interface MarkdownRendererProps extends React.HTMLAttributes<HTMLDivElement> {
   children?: string | null;
+  copyButtonProps?: React.HTMLAttributes<HTMLButtonElement>;
 }
 
-function appendCopyButton(container?: HTMLDivElement | null) {
+function appendCopyButton(
+  container?: HTMLDivElement | null,
+  buttonProps?: React.HTMLAttributes<HTMLButtonElement>
+) {
   if (!container) {
     return;
   }
 
   const button = document.createElement('button');
-  button.className =
-    'copy-code-button rs-btn-icon rs-btn-icon-circle rs-btn rs-btn-subtle rs-btn-xs';
+  button.className = 'btn-copy-code';
   button.title = 'Copy code';
   button.innerHTML = svgTpl(copyPath);
+
   button.onclick = e => {
     e.preventDefault();
     const code = container?.querySelector('code')?.textContent;
@@ -33,18 +37,26 @@ function appendCopyButton(container?: HTMLDivElement | null) {
       icon?.setAttribute('d', copyPath);
     }, 2000);
   };
+
+  if (buttonProps) {
+    Object.entries(buttonProps || {}).forEach(([key, value]) => {
+      button.setAttribute(key, value);
+    });
+  }
+
   container?.appendChild(button);
 }
 
 const MarkdownRenderer = React.forwardRef(
   (props: MarkdownRendererProps, ref: React.Ref<HTMLDivElement>) => {
-    const { children, className, ...rest } = props;
+    const { children, className, copyButtonProps, ...rest } = props;
     const mdRef = React.useRef<HTMLDivElement>(null);
 
     useEffect(() => {
       mdRef.current?.querySelectorAll('.rcv-code-renderer').forEach((el: any) => {
-        appendCopyButton(el);
+        appendCopyButton(el, copyButtonProps);
       });
+      // eslint-disable-next-line react-hooks/exhaustive-deps
     }, []);
 
     if (!children) {