in src/app/components/vertical-bar-chart/vertical-bar-chart.component.ts [218:225]
adjustOpacity(rgba: string, opacity: number) {
const rgbaValues = rgba.match(/[\d.]+/g);
if (!rgbaValues || rgbaValues.length < 4) {
return rgba;
}
rgbaValues[3] = String(opacity);
return `rgba(${rgbaValues.join(',')})`;
}