diff --git a/src/sass/variables.scss b/src/sass/variables.scss
index 2d78b8f5f..c5c92631f 100644
--- a/src/sass/variables.scss
+++ b/src/sass/variables.scss
@@ -1,33 +1,33 @@
 
-$out-of-range-color: lighten(#333, 40%);
-$out-of-range-bg-color: lighten(#333, 70%);
+$out-of-range-color: lighten(#333, 40%) !default;
+$out-of-range-bg-color: lighten(#333, 70%) !default;
 
-$calendar-border: #DDD;
-$cell-border: #DDD;
+$calendar-border: #DDD !default;
+$cell-border: #DDD !default;
 
-$border-color: #CCC;
+$border-color: #CCC !default;
 
-$segment-width: percentage(1 / 7);
+$segment-width: percentage(1 / 7) !default;
 
-$time-selection-color: white;
-$time-selection-bg-color: rgba(0,0,0, .50);
-$date-selection-bg-color: rgba(0,0,0, .10);
+$time-selection-color: white !default;
+$time-selection-bg-color: rgba(0,0,0, .50) !default;
+$date-selection-bg-color: rgba(0,0,0, .10) !default;
 
 
-$event-bg: #3174ad;
-$event-border: darken(#3174ad, 10%);
-$event-outline: #3b99fc;
-$event-color: #fff;
-$event-border-radius: 5px;
-$event-padding: 2px 5px;
-$event-zindex: 4;
+$event-bg: #3174ad !default;
+$event-border: darken(#3174ad, 10%) !default;
+$event-outline: #3b99fc !default;
+$event-color: #fff !default;
+$event-border-radius: 5px !default;
+$event-padding: 2px 5px !default;
+$event-zindex: 4 !default;
 
-$btn-color: #373a3c;
-$btn-bg: #fff;
-$btn-border: #ccc;
+$btn-color: #373a3c !default;
+$btn-bg: #fff !default;
+$btn-border: #ccc !default;
 
-$current-time-color: #74ad31;
+$current-time-color: #74ad31 !default;
 
-$rbc-css-prefix: rbc-i;
+$rbc-css-prefix: rbc-i !default;
 
-$today-highlight-bg: #eaf6ff;
+$today-highlight-bg: #eaf6ff !default;