You can rotate the text horizontally by adding the following css.
.c3-grid text { fill: #000; transform:rotate(0deg) translate(266px, 0px); }
If you want to add more rows, you must increase the value manually.
You can also specify a position as:
x: { lines: [ {value: "2016-01-08", text: "Want to rorate this text in 180 degrees", class: "xLineLable", position: "outer-middle"} ]
Working script
Edit:
If you want a horizontal line, then why don't you add to ygrid.
grid: { y: { lines: [ {value: 50,text: "Want to rorate this text in 180 degrees", class: "xLineLable", position: "middle"}, ] },
Fiddle
ketan
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