Style SVG circle with CSS

Question

So I have my SVG-circle.

Answer 1

This should work for you.

jsfiddle

You need to manipulate the radius and this can only be done via javascript:

$(function () {
    $("svg circle").on("mouseenter", function () {

        var oldR = $(this).attr("r");

        var newR = (((oldR*2)/100)*120)/2; // 120% width

        $(this).attr("r", newR);

    });
});