Pie Charts are not coming as exact circle, it's coming as bit oval

Navaneethakrishnan Babu

"chart1": {
              "labels": [
                "L1",
                "L2",
                "L3",
                "L4",
                "L5",
                "L6",
                "Others"
              ],
              "datasets": [
                {
                  "data": {
                    "Input": [
                      14,
                      18,
                      34,
                      14,
                      12,
                      10,
                      24
                    ],
                    "pageOutput": [
                       2000,
                       200,
                       2000,
                       200,
                       2000,
                       2000,
                       200
                    ]
                  },
                  "backgroundColor": [
                    "#6E6F6D",
                    "#8e5ea2",
                    "#3cba9f",
                    "#e8c3b9",
                    "#c45850",
                    "#67f634",
                    "#f61752"
                  ],
                  "label": "Chart1 Summary"
                }
              ],
              "view": "vertical",
              "type": "pie"
            }

my chart data are above, I want my pie chart as exact oval.. What i need to do more on this ?

Navaneethakrishnan Babu

And How do I Change label font color? by default, It's looking dull/blur