score:0

managed to remove the bottom line, but somehow could not remove the padding, - commented an area, which removes a little bit, but then you lose the ticks (which is obviously bad)

just adding a fiddle, hope it helps at least somehow!

https://jsfiddle.net/aokzss3c/1/

..xaxes..
ticks: {
    display: true, // removing this
    fontcolor: '#0071bc',
},

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