unable to build docker-compose yml file

Question

I am trying to create container with ssh service and I have successfully created a dockerfile with following code:

FROM centos
RUN yum -y install openssh-server
RUN useradd remote_user &&
echo "1234" | passwd remote_user --stdin &&
mkdir /home/remote_user/.ssh &&
chmod 700 /home/remote_user/.ssh
COPY remote-key.pub /home/remote_user/.ssh/authorized_keys
RUN chown remote_user:remote_user -R /home/remote_user/.ssh/ &&
chmod 600 /home/remote_user/.ssh/authorized_keys
RUN /usr/sbin/sshd-keygen
CMD /usr/sbin/sshd -D

Docker-compose.yml code:

version: '3'
services:
jenkins:
container_name: jenkins
image: jenkins/jenkins
ports:
- "8080:8080"
volumes:
- "$PWD/jenkins_home:/var/jenkins_home"
networks:
- net
remote_host:
container_name: remote-host
image: remote-host
build:
context: centos7
networks:
- net
networks:
net:

when I execute the "docker-compose build" command I get the following error:

ERROR: yaml.scanner.ScannerError: mapping values are not allowed here
in "./docker-compose.yml", line 5, column 12

Please help me in resolving this issue. Appreciate your help!!!