Ok open up template.css line 614 and look for the below and swap to 0.5 as I have done and also add the margin-top:
.s5_wrap_fmfullwidth #s5_logo_wrap img {
transform: scale(0.5);
-webkit-transform: scale(0.5);
-moz-transform: scale(0.5);
-ms-transform: scale(0.5);
-o-transform: scale(0.5);
margin-top:-18px;}