Add project files.

ConstructorAppUI/wwwroot/AdminTheme/build/scss/mixins/_cards.scss

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+//
+// Mixins: Cards Variant
+//
+
+@mixin cards-variant($name, $color) {
+  .card-#{$name} {
+    &:not(.card-outline) {
+      > .card-header {
+        background-color: $color;
+
+        &,
+        a {
+          color: color-yiq($color);
+        }
+
+        a.active {
+          color: color-yiq($white);
+        }
+      }
+    }
+
+    &.card-outline {
+      border-top: 3px solid $color;
+    }
+
+    &.card-outline-tabs {
+      > .card-header {
+        a:hover{
+          border-top: 3px solid $nav-tabs-border-color;
+        }
+        a.active,
+        a.active:hover{
+          border-top: 3px solid $color;
+        }
+      }
+    }
+  }
+
+  .bg-#{$name},
+  .bg-gradient-#{$name},
+  .card-#{$name}:not(.card-outline) {
+    > .card-header {
+      .btn-tool {
+        color: rgba(color-yiq($color), .8);
+
+        &:hover {
+          color: color-yiq($color);
+        }
+      }
+    }
+  }
+
+  .card.bg-#{$name},
+  .card.bg-gradient-#{$name} {
+    .bootstrap-datetimepicker-widget {
+      .table td,
+      .table th {
+        border: none;
+      }
+
+      table thead tr:first-child th:hover,
+      table td.day:hover,
+      table td.hour:hover,
+      table td.minute:hover,
+      table td.second:hover {
+        background-color: darken($color, 8%);
+        color: color-yiq($color);
+      }
+
+      table td.today::before {
+        border-bottom-color: color-yiq($color);
+      }
+
+      table td.active,
+      table td.active:hover {
+        background-color: lighten($color, 10%);
+        color: color-yiq($color);
+      }
+    }
+  }
+}
+