Mysql Server and App Container in some host

General
1

I need to upload the application container and mysql server on the same host, but the containers can not find mysql server, can you help me?

#####DOCKER COMPOSE

version: '3'
services:
  proxy: 
    image: nginx
    ports:
     - "80:80"
     - "443:443"
    volumes:
     - /home/docker/nginx/default.conf:/etc/nginx/conf.d/default.conf
     - /home/docker/nginx/ssl/:/etc/nginx/ssl/
    links: 
     - zabbix-web:zabbix-web
  zabbix-web:
    image: zabbix/zabbix-web-nginx-mysql:ubuntu-latest
    links:
     - zabbix-server:zabbix-server
     - mysql-server:mysql-server
    environment:
     - MYSQL_USER=user
     - MYSQL_PASSWORD=pass
     - ZBX_SERVER_HOST=zabbix-server
     - TZ=America/Sao_Paulo
  zabbix-server:
    image: zabbix/zabbix-server-mysql:ubuntu-latest
    links:
     - mysql-server:mysql-server
    ports:
     - "10051:10051"
    volumes:
     - /home/docker/zabbix-server/script/:/usr/lib/zabbix/alertscripts
    environment:
     - MYSQL_USER=user
     - MYSQL_PASSWORD=pass
  mysql-server:
    image: mysql/mysql-server:5.6
    volumes:
     - /home/data/mysql/:/var/lib/mysql
    environment:
     - MYSQL_ROOT_PASSWORD=pass

#####ERROR

#docker logs  docker_zabbix-server_1
**Deploying Zabbix server with mysql database
** Preparing the system
** Preparing Zabbix server
********************
* DB_SERVER_HOST: mysql-server
* DB_SERVER_PORT: 3306
* DB_SERVER_DBNAME: zabbix
* DB_SERVER_ZBX_USER: user
* DB_SERVER_ZBX_PASS: pass
********************
**** MySQL server is not available. Waiting 5 seconds...
**** MySQL server is not available. Waiting 5 seconds...
**** MySQL server is not available. Waiting 5 seconds...