refactor: move scss to assets

src/assets/scss/_custom.scss

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+// Here you can add other styles

src/assets/scss/_variables.scss

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+// Variable overrides

src/assets/scss/style.scss

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+// If you want to override variables do it here
+@import "variables";
+
+// Import styles
+@import "~@coreui/coreui/scss/coreui";
+
+// If you want to add something do it here
+@import "custom";

src/assets/scss/vendors/_variables.scss

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+// Override Boostrap variables
+@import "../variables";
+@import "~@coreui/coreui/scss/bootstrap-variables";
+@import "~bootstrap/scss/mixins";
+@import "~bootstrap/scss/functions";
+@import "~bootstrap/scss/variables";
+@import "~@coreui/coreui/scss/variables";

src/assets/scss/vendors/chart.js/chart.scss

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+// Import variables
+@import '../variables';
+
+.chart-legend,
+.bar-legend,
+.line-legend,
+.pie-legend,
+.radar-legend,
+.polararea-legend,
+.doughnut-legend {
+  list-style-type: none;
+  margin-top: 5px;
+  text-align: center;
+  -webkit-padding-start: 0;
+  -moz-padding-start: 0;
+  padding-left: 0;
+}
+.chart-legend li,
+.bar-legend li,
+.line-legend li,
+.pie-legend li,
+.radar-legend li,
+.polararea-legend li,
+.doughnut-legend li {
+  display: inline-block;
+  white-space: nowrap;
+  position: relative;
+  margin-bottom: 4px;
+  @include border-radius($border-radius);
+  padding: 2px 8px 2px 28px;
+  font-size: smaller;
+  cursor: default;
+}
+.chart-legend li span,
+.bar-legend li span,
+.line-legend li span,
+.pie-legend li span,
+.radar-legend li span,
+.polararea-legend li span,
+.doughnut-legend li span {
+  display: block;
+  position: absolute;
+  left: 0;
+  top: 0;
+  width: 20px;
+  height: 20px;
+  @include border-radius($border-radius);
+}