If you want to increase or decrease the font size of the title, this is how to do it:
1. First please backup your files before applying any modification.
2. Head to Appearance->Editor and select “style.css” in the right column.
3. Look for this code (near line 130)
#header #title {
font-family: Droid Sans, sans-serif;
font-weight: bold;
font-size: 100px;
line-height: 100px;
margin: 80px 0 10px -5px;
text-transform: uppercase;
}
4. Change the value of font size to your desired value
ie font-size: 80 px
5. Update file.