Well, I can't see your screenshot that you have added here.
However, there are different scopes of approach
Take a look below :
if you are using:
For Centos
sudo chown -R centos:centos /var/www/html
sudo chmod -R 755 /var/www/html
For Ubuntu
sudo chown -R ubuntu:ubuntu /var/www/html
sudo chmod -R 755 /var/www/html
For Amazon AMI
sudo chown -R ec2-user:ec2-user /var/www/html
sudo chmod -R 755 /var/www/html
Hope it helps, otherwise feel free to revert to me.