...You can then easily change the weight of the icon by changing stroke-width attribute. You can also change the shape of the line caps and the line joins with stroke-linecap and stroke-linejoin. This will change the style of the icons by making them rounded or squared off. All these stroke properties are also available to use in CSS. Since there is a 2px margin between the paths and viewBox, I recommend not having a stroke-width larger than 4px (or 12.5%). 4px might seems small but it's relative to the 32x32 grid.