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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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HTML

            
              <script src="//www.amcharts.com/lib/4/core.js"></script>
<script src="//www.amcharts.com/lib/4/charts.js"></script>
<script src="//www.amcharts.com/lib/4/themes/animated.js"></script>
<div id="chartdiv"></div>
!

CSS

            
              body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
  width: 100%;
  height: 250px;
}
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JS

            
              /**
 * ---------------------------------------
 * This demo was created using amCharts 4.
 *
 * For more information visit:
 * https://www.amcharts.com/
 *
 * Documentation is available at:
 * https://www.amcharts.com/docs/v4/
 * ---------------------------------------
 */

am4core.useTheme(am4themes_animated);

// Create chart instance
var chart = am4core.create("chartdiv", am4charts.XYChart);

// Add data
chart.data = [{
  "category": "Research",
  "value": 450
}, {
  "category": "Marketing",
  "value": 1200
}, {
  "category": "Distribution",
  "value": 1850
}];

// Create axes
var categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "category";
categoryAxis.renderer.grid.template.location = 0;
//categoryAxis.renderer.minGridDistance = 30;

var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());

// Create series
var series = chart.series.push(new am4charts.ColumnSeries());
series.dataFields.valueY = "value";
series.dataFields.categoryX = "category";

chart.background.fill = chart.colors.getIndex(2);

var fillModifier = new am4core.LinearGradientModifier();
fillModifier.opacities = [0, 0.2, 0.3, 0.2, 0];
fillModifier.offsets = [0, 0.2, 0.5, 0.8, 1];
fillModifier.gradient.rotation = 90;
chart.background.fillModifier = fillModifier;

chart.exporting.menu = new am4core.ExportMenu();

chart.exporting.events.on("exportstarted", function(ev) {
  if (ev.format == "print") {
    chart.background.visible = false;
  }
});

chart.exporting.events.on("exportfinished", function(ev) {
  if (ev.format == "print") {
    chart.background.visible = true;
  }
});
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