When checking my website on Safari using an iPad or iPhone, I noticed that I can touch and drag left to right, causing the entire window to move and reveal the grey background behind it. Here is a link to my page.
However, when visiting other websites, nothing happens when I try to touch and drag left to right. An example of this can be seen by following this link: here.
I'm curious how these sites prevent dragging. On my own page, after dragging the window to the left, there is a white space visible at the edge of the green background at the top. How can I remove this? Shouldn't the div cover the entire width of the screen?