Tried different browsers and devices and seems like the problem is only with that page. You can get to that page from https://gazebosim.org/tutorials and going to 'Installation' page.
I am sorry if it is the wrong place to for that issue. Feel free to close it if it is.
The https://gazebosim.org/tutorials?cat=install page shows the following error:![image](https://user-images.githubusercontent.com/28868430/161441803-40a93715-db0f-40ce-8976-1697c551af70.png)
Tried different browsers and devices and seems like the problem is only with that page. You can get to that page from https://gazebosim.org/tutorials and going to 'Installation' page. I am sorry if it is the wrong place to for that issue. Feel free to close it if it is.