Hello!
When the top menu flips over to fixed position then content jumps up 91 pixels (height of non fixed header).
Here are two possible solutions:
1. Scroll top menu up, move main content and footer down 91px when menu becomes fixed
.fixed-header + #main-wrapper,
.fixed-header + #colophon {
position: relative;
top: 91px;
}
2. Always a fixed top menu
#masthead {
position: fixed;
}
#main-wrapper,
#colophon {
position: relative;
top: 91px;
}
Put code in Appearance / Theme options / Custom CSS
Nice if theme could implement alt 1!
Best regards Johan