> I always had this issue that a div has standard border padding, and width:100% pushes its right to out of viewport. You likely want `box-sizing: border-box`:

> I always had this issue that a div has standard border padding, and width:100% pushes its right to out of viewport. You likely want `box-sizing: border-box`: https://www.paulirish.com/2012/box-sizing-border-box-ftw/ https://www.paulirish.com/2012/box-sizing-border-box-ftw/