So .pho-section had a left margin which was kind of harmless at first, but when the AutoSizer plugin appeared, it forced the width of this element to the size of the viewport.
Which means viewport's size + margin = larger than the viewport and in that case there's something to scroll horizontally.
So I changed the margin with right & left padding and add a box-sizing: border-box so that even if width is calculated by AutoSizer, it renders accordingly. No more scroll. :)
GoOz
commented
7 years ago 
So
.pho-sectionhad a left margin which was kind of harmless at first, but when the AutoSizer plugin appeared, it forced the width of this element to the size of the viewport. Which means viewport's size + margin = larger than the viewport and in that case there's something to scroll horizontally.So I changed the margin with right & left padding and add a
box-sizing: border-boxso that even if width is calculated by AutoSizer, it renders accordingly. No more scroll. :)