diff --git a/Dockerfile b/Dockerfile
index 93ac2505e..e8f717b7c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,4 @@
-# This Dockerfile is friendly to users in Chinese Mainland :)
-# For users outside mainland China, feel free to modify or delete them :)
-
-# Use a base image with Python 3.9.17 slim version (Bullseye)
+# Use a base image with Python3.9 and Nodejs20 slim version
 FROM nikolaik/python-nodejs:python3.9-nodejs20-slim
 
 # Install Debian software needed by MetaGPT
@@ -9,21 +6,15 @@ RUN apt update &&\
     apt install -y git chromium fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst fonts-freefont-ttf libxss1 --no-install-recommends &&\
     apt clean
 
-# Set the working directory to /app
-WORKDIR /app
-
 # Install Mermaid CLI globally
-ENV CHROME_BIN="/usr/bin/chromium"
-ENV AM_I_IN_A_DOCKER_CONTAINER Yes
-ADD puppeteer-config.json  /puppeteer-config.json
+ENV CHROME_BIN="/usr/bin/chromium" \
+    AM_I_IN_A_DOCKER_CONTAINER="true"
 RUN npm install -g @mermaid-js/mermaid-cli &&\
     npm cache clean --force
 
-# Copy src to container the MetaGPT repository
-COPY . /app/metagpt
-
 # Install Python dependencies and install MetaGPT
-RUN cd metagpt &&\
+COPY . /app/metagpt
+RUN cd /app/metagpt &&\
     mkdir workspace &&\
     pip install -r requirements.txt &&\
     pip cache purge &&\
diff --git a/README.md b/README.md
index 84f9ee293..c43ddb2ec 100644
--- a/README.md
+++ b/README.md
@@ -92,7 +92,8 @@ ### Build image by yourself
 
 ```bash
 # You can also build metagpt image by yourself.
-cd metagpt && docker build --network host -t metagpt:v0.3 .
+git clone https://github.com/geekan/MetaGPT.git
+cd MetaGPT && docker build -t metagpt:v0.3 .
 ```
 
 ## Configuration
diff --git a/metagpt/utils/mermaid.py b/metagpt/utils/mermaid.py
index edb09ffc7..51e54ac33 100644
--- a/metagpt/utils/mermaid.py
+++ b/metagpt/utils/mermaid.py
@@ -13,7 +13,7 @@ from metagpt.const import PROJECT_ROOT
 from metagpt.logs import logger
 from metagpt.utils.common import check_cmd_exists
 
-IS_DOCKER = os.environ.get('AM_I_IN_A_DOCKER_CONTAINER', False)
+IS_DOCKER = os.environ.get('AM_I_IN_A_DOCKER_CONTAINER', 'false').lower()
 
 
 def mermaid_to_file(mermaid_code, output_file_without_suffix, width=2048, height=2048) -> int:
@@ -30,17 +30,20 @@ def mermaid_to_file(mermaid_code, output_file_without_suffix, width=2048, height
     tmp.write_text(mermaid_code, encoding='utf-8')
 
     if check_cmd_exists('mmdc') != 0:
-        logger.warning("RUN `npm install -g @mermaid-js/mermaid-cli` to install mmdc")
+        logger.warning(
+            "RUN `npm install -g @mermaid-js/mermaid-cli` to install mmdc")
         return -1
 
     for suffix in ['pdf', 'svg', 'png']:
         output_file = f'{output_file_without_suffix}.{suffix}'
         # Call the `mmdc` command to convert the Mermaid code to a PNG
         logger.info(f"Generating {output_file}..")
-        if IS_DOCKER:
-            subprocess.run(['mmdc', '-p', '/puppeteer-config.json', '-i', str(tmp), '-o', output_file, '-w', str(width), '-H', str(height)])
+        if IS_DOCKER == 'true':
+            subprocess.run(['mmdc', '-p', '/app/metagpt/puppeteer-config.json', '-i',
+                           str(tmp), '-o', output_file, '-w', str(width), '-H', str(height)])
         else:
-            subprocess.run(['mmdc', '-i', str(tmp), '-o', output_file, '-w', str(width), '-H', str(height)])
+            subprocess.run(['mmdc', '-i', str(tmp), '-o',
+                           output_file, '-w', str(width), '-H', str(height)])
     return 0