I have been trying to use a SVG logo format for the header, which results in bugs between browers. At some point the top bar disappears. With a PGN, works fine but SVG, not really. Anyway I would like to find the proper SVG size to optimise the site speed and performance. What SVG size do you recommend for a logo in the header?
You need to open your SVG icons file with some editor like Sublime Text or default system text editor and add width=”31″ height=”40″ attributes to your <svg> tag like it is shown: http://prntscr.com/m4n0qw
Then you will need to re-upload your icons in WordPress Dashboard.