message: feat(datepicker): Use !default for SASS variables
  In order to be able to override the variables in SASS, each variable declaration should have a `!default` flag (http://sass-lang.com/documentation/file.SASS_REFERENCE.html#Variable_Defaults___default).
diff: -$main-bg: #fff;
  -$custom-range-bg: #eee;
  +$main-bg: #fff !default;
  +$custom-range-bg: #eee !default;
  -$main-box-shadow: #aaa;
  +$main-box-shadow: #aaa !default;
  -$font-color-01: #fff;
  -$font-color-02: #9aaec1;
  -$font-color-03: #54708b;
  +$font-color-01: #fff !default;
  +$font-color-02: #9aaec1 !default;
  +$font-color-03: #54708b !default;
  -$border-color: #e9edf0;
  -$highlighted: #e9edf0;
  +$border-color: #e9edf0 !default;
  +$highlighted: #e9edf0 !default;
  -$btn-bg: #e9edf0;
  -$btn-bg-hover: #d5dadd;
  +$btn-bg: #e9edf0 !default;
  +$btn-bg-hover: #d5dadd !default;
  -$btn-bg2: #9aaec1;
  -$btn-bg2-hover: #54708b;
  +$btn-bg2: #9aaec1 !default;
  +$btn-bg2-hover: #54708b !default;
  -$theme-gray: #777;
  -$theme-green: #5cb85c;
  -$theme-blue: #5bc0de;
  -$theme-dark-blue: #337ab7;
  -$theme-red: #d9534f;
  -$theme-orange: #f0ad4e;
  +$theme-gray: #777 !default;
  +$theme-green: #5cb85c !default;
  +$theme-blue: #5bc0de !default;
  +$theme-dark-blue: #337ab7 !default;
  +$theme-red: #d9534f !default;
  +$theme-orange: #f0ad4e !default;
  -$disabled-background: rgba(221, 221, 221, 0.3);
  -$disabled-color: #f5f5f5;
  +$disabled-background: rgba(221, 221, 221, 0.3) !default;
  +$disabled-color: #f5f5f5 !default;
  $theme-list: (
  'default': $theme-gray,
  @@ -33,4 +33,4 @@ $theme-list: (
  'dark-blue': $theme-dark-blue,
  'red': $theme-red,
  'orange': $theme-orange,
  -);
  +) !default;
  