Originally got this from this codepen http://codepen.io/netsi1964/pen/iyglK and then just adapted it to make it really simple. I used Inkscape for the SVG & literally just drew a couple of shapes and then opened up the SVG using a text editor. Everyting in the SVG was then just pasted in where the code below shows "<svg class="" etc., I just kept the class name. You can hide the intial strokes by making the width 0 in the raw SVG.
Check it out on this Codepen