Please try with the below code snippet. To remove gradient effect you have to set 'overlay: null' in chart.
<div id="chart"></div>
<script>
var data = [
{
"source": "Hydro",
"percentage": 22,
"explode": true
},
{
"source": "Solar",
"percentage": 2
},
{
"source": "Nuclear",
"percentage": 49
},
{
"source": "Wind",
"percentage": 27
}
];
$(document).ready(function () {
$("#chart").kendoChart({
title: {
text: "Break-up of Spain Electricity Production for 2008"
},
legend: {
position: "bottom"
},
dataSource: {
data: data
},
seriesDefaults: {
overlay: {
gradient: null
}
},
series: [{
type: "pie",
field: "percentage",
categoryField: "source",
explodeField: "explode"
}],
seriesColors: ["#03a9f4", "#ff9800", "#fad84a", "#4caf50"],
tooltip: {
visible: true,
template: "${ category } - ${ value }%"
}
});
});
</script>
Let me know if any concern.