How to prevent Iphone from going sideways on web browser/youtube?

[pauly800]

I use safari when using the browser. However many times i would do this when lying on the bed. I rarely watch videos or check sites with my iphone sideways. However when i'm on the bed and rotate to the side, the iphone would do the same thing. Is there a way to prevent this from happening? Very annoying.

 

[richwoodrocket]

Swipe up to get to control center then tap the icon on the very right. With the lock symbol.

 

[KAMB]