NIHVIVO-559: 
NIHVIVO-559: 

Made the following changes:
1- Apply header consistency in term of colors across Wilma theme
2- Change header tags (h1,h2, etc) to em format
3- Arrows in hover links were positioned incorrectly, now it's fixed.

vivo-project/VIVO,vivo-project/VIVO,vivo-project/VIVO,vivo-project/VIVO