https://www.toptal.com/developers/css/sprite-generator gap 500px
main btn => 557px(5.8inches)
REACT_APP_AGENT_API=http://220.135.67.240:8000/online
REACT_APP_AGENT_SOCKET=ws://220.135.67.240:8000
REACT_APP_AGENT_SRS_PORT=1985
REACT_APP_HOST_NAME=DEV
REACT_APP_AGENT_API='http://59.126.75.154:8000/online'
REACT_APP_AGENT_SOCKET='ws://59.126.75.154:8000'
REACT_APP_AGENT_SRS_PORT=1985
REACT_APP_HOST_NAME=WHEEL
REACT_APP_AGENT_API='http://59.126.75.154:3031/online'
REACT_APP_AGENT_SOCKET='ws://59.126.75.154:3031'
REACT_APP_AGENT_SRS_PORT=1986
REACT_APP_HOST_NAME=DEMO