diff --git a/README.md b/README.md
index f381159..a11bc6b 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,15 @@ docker run -it --rm -p 6080:80 -p 5900:5900 -e VNC_PASSWORD=mypassword dorowu/ub
 A prompt will ask password either in the browser or vnc viewer.
 
 
+Screen Resolution
+------------------
+
+Resolution of virtual desktop adapts browser window size when first connecting the server. You may choose a fixed resolution by passing `RESOLUTION` environment variable, for example
+
+```
+docker run -it --rm -p 6080:80 -e RESOLUTION=1920x1080 dorowu/ubuntu-desktop-lxde-vnc
+```
+
 Troubleshooting and FAQ
 ==================
 
diff --git a/image/startup.sh b/image/startup.sh
index a7f413a..048ee07 100755
--- a/image/startup.sh
+++ b/image/startup.sh
@@ -14,6 +14,10 @@ if [ -n "$VNC_PASSWORD" ]; then
     export VNC_PASSWORD=
 fi
 
-cd /usr/lib/web && ./run.py > /var/log/web.log 2>&1 &
+if [ -n "$RESOLUTION" ]; then
+    sed -i "s/1024x768/$RESOLUTION/" /etc/supervisor/conf.d/supervisord.conf
+fi
+
+cd /usr/lib/web && ./run.py 2>&1 &
 nginx -c /etc/nginx/nginx.conf
 exec /bin/tini -- /usr/bin/supervisord -n
diff --git a/image/usr/lib/web/lightop/__init__.py b/image/usr/lib/web/lightop/__init__.py
index 692887c..68b237a 100644
--- a/image/usr/lib/web/lightop/__init__.py
+++ b/image/usr/lib/web/lightop/__init__.py
@@ -18,6 +18,8 @@ app = Flask(
 CONFIG = os.environ.get('CONFIG') or 'config.Development'
 app.config.from_object('config.Default')
 app.config.from_object(CONFIG)
+FIRST = 'RESOLUTION' not in os.environ
+
 
 # logging
 import logging