Accepted answer

You should set the legend.y to some positive number to move it further down.

legend: {
            layout: 'horizontal',
            align: 'center',
            itemWidth: LegendWidth,
            verticalAlign: 'bottom',
            floating: true,
            margin: 25,
            borderWidth: 3,
            y : 25 /* pushes the legend 25 points down */

Here is the doc, and here is a sample

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