score:1

Accepted answer

If you want the SVG to scale to fit its parent element, it needs to have a viewBox attribute.

Instead of setting the width and height of your SVG, use those values for the viewBox instead.

Change

.attr("width", width + margin.right + margin.left)
.attr("height", height + margin.top + margin.bottom);

to

.attr("viewBox", [0, 0, (width + margin.right + margin.left),
                        (height + margin.top + margin.bottom)].join(' '))

Updated Codepen

You may want to tweak the width and height components of the viewBox if you want, to remove the gap on the right, so it fits more neatly.


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