KcGuitfiddle on "[Theme: Customizr] Alter this code to create fade effect"

header.tc-header {
border-bottom: 12px solid #4a7023;
}

This is the code I dropped into my "Custom CSS" box to change the color and width of the grey bar above the slider and below the header. Id like to make this bar (from top to bottom) fade from #e7ffcf to #4a7023.