Added missing files

Author: gwinnem

src/styles/index.scss

@@ -0,0 +1 @@
+@import 'variables';

src/styles/variables.scss

@@ -0,0 +1,13 @@
+// Color used for the gridlines
+$grid-line-color: #000;
+
+// GridItem
+$grid-item-bg-color: #726e6e;
+$grid-item-border-radius: 12px;
+$grid-item-text-color: white;
+$grid-item-font-size: 1rem;
+$grid-item-static-bg-color: #393d42;
+
+// Color and opacity used to display the drag placeholder
+$grid-item-placeholder-bg-color: #8f3c3c;
+$grid-item-placeholder-opacity: .5;