My logo is too long and high so that the rest of the icons wrap on to a second line. I have tried to reduce the size of the graphic but it stays at the same size but is now pixilated.

How can I reduce the size of the logo?

Hi,

my suggestion please remove that logo for mobile. because there is no space anymore at toolbar.
if you want still using the logo for mobile, please put this CSS code at:
/jupgrade/templates/socialize/css/custom.css

.navbar-brand.visible-xs img {
  height: auto;
  margin-top: 15px;
  max-width: 180px;
}

Thank you. I have just removed the logo - much easier!