Prefer lowercase hex values as declared in styling guideline.

app/assets/stylesheets/pages/merge_conflicts.scss

 $colors: (
   white_header_head_neutral   : #e1fad7,
   white_line_head_neutral     : #effdec,
-  white_button_head_neutral   : #9ADB84,
+  white_button_head_neutral   : #9adb84,
 
   white_header_head_chosen    : #baf0a8,
   white_line_head_chosen      : #e1fad7,
-  white_button_head_chosen    : #52C22D,
+  white_button_head_chosen    : #52c22d,
 
   white_header_origin_neutral : #e0f0ff,
   white_line_origin_neutral   : #f2f9ff,
-  white_button_origin_neutral : #87C2FA,
+  white_button_origin_neutral : #87c2fa,
 
   white_header_origin_chosen  : #add8ff,
   white_line_origin_chosen    : #e0f0ff,
-  white_button_origin_chosen  : #268CED,
+  white_button_origin_chosen  : #268ced,
 
-  white_header_not_chosen     : #F0F0F0,
+  white_header_not_chosen     : #f0f0f0,
   white_line_not_chosen       : #f9f9f9,
 
 
-  dark_header_head_neutral   : rgba(#33FF33, .2),
-  dark_line_head_neutral     : rgba(#33FF33, .1),
-  dark_button_head_neutral   : #40874F,
+  dark_header_head_neutral   : rgba(#33ff33, .2),
+  dark_line_head_neutral     : rgba(#33ff33, .1),
+  dark_button_head_neutral   : #40874f,
 
-  dark_header_head_chosen    : rgba(#33FF33, .33),
-  dark_line_head_chosen      : rgba(#33FF33, .2),
+  dark_header_head_chosen    : rgba(#33ff33, .33),
+  dark_line_head_chosen      : rgba(#33ff33, .2),
   dark_button_head_chosen    : #258537,
 
   dark_header_origin_neutral : rgba(#2878c9, .4),
@@ -35,28 +35,28 @@ $colors: (
   dark_line_origin_chosen    : rgba(#2878c9, .4),
   dark_button_origin_chosen  : #1d6cbf,
 
-  dark_header_not_chosen     : rgba(#FFF, .25),
-  dark_line_not_chosen       : rgba(#FFF, .1),
+  dark_header_not_chosen     : rgba(#fff, .25),
+  dark_line_not_chosen       : rgba(#fff, .1),
 
 
-  monokai_header_head_neutral   : rgba(#A6E22E, .25),
-  monokai_line_head_neutral     : rgba(#A6E22E, .1),
+  monokai_header_head_neutral   : rgba(#a6e22e, .25),
+  monokai_line_head_neutral     : rgba(#a6e22e, .1),
   monokai_button_head_neutral   : #376b20,
 
-  monokai_header_head_chosen    : rgba(#A6E22E, .4),
-  monokai_line_head_chosen      : rgba(#A6E22E, .25),
+  monokai_header_head_chosen    : rgba(#a6e22e, .4),
+  monokai_line_head_chosen      : rgba(#a6e22e, .25),
   monokai_button_head_chosen    : #39800d,
 
-  monokai_header_origin_neutral : rgba(#60D9F1, .35),
-  monokai_line_origin_neutral   : rgba(#60D9F1, .15),
-  monokai_button_origin_neutral : #38848C,
+  monokai_header_origin_neutral : rgba(#60d9f1, .35),
+  monokai_line_origin_neutral   : rgba(#60d9f1, .15),
+  monokai_button_origin_neutral : #38848c,
 
-  monokai_header_origin_chosen  : rgba(#60D9F1, .5),
-  monokai_line_origin_chosen    : rgba(#60D9F1, .35),
-  monokai_button_origin_chosen  : #3EA4B2,
+  monokai_header_origin_chosen  : rgba(#60d9f1, .5),
+  monokai_line_origin_chosen    : rgba(#60d9f1, .35),
+  monokai_button_origin_chosen  : #3ea4b2,
 
-  monokai_header_not_chosen     : rgba(#FFF, .24),
-  monokai_line_not_chosen       : rgba(#FFF, .1),
+  monokai_header_not_chosen     : rgba(#fff, .24),
+  monokai_line_not_chosen       : rgba(#fff, .1),
 
 
   solarized_light_header_head_neutral   : rgba(#859900, .37),
@@ -67,16 +67,16 @@ $colors: (
   solarized_light_line_head_chosen      : rgba(#859900, .37),
   solarized_light_button_head_chosen    : #94993d,
 
-  solarized_light_header_origin_neutral : rgba(#2878C9, .37),
-  solarized_light_line_origin_neutral   : rgba(#2878C9, .15),
-  solarized_light_button_origin_neutral : #60A1BF,
+  solarized_light_header_origin_neutral : rgba(#2878c9, .37),
+  solarized_light_line_origin_neutral   : rgba(#2878c9, .15),
+  solarized_light_button_origin_neutral : #60a1bf,
 
-  solarized_light_header_origin_chosen  : rgba(#2878C9, .6),
-  solarized_light_line_origin_chosen    : rgba(#2878C9, .37),
+  solarized_light_header_origin_chosen  : rgba(#2878c9, .6),
+  solarized_light_line_origin_chosen    : rgba(#2878c9, .37),
   solarized_light_button_origin_chosen  : #2482b2,
 
-  solarized_light_header_not_chosen     : rgba(#FFF, .37),
-  solarized_light_line_not_chosen       : rgba(#FFF, .2),
+  solarized_light_header_not_chosen     : rgba(#fff, .37),
+  solarized_light_line_not_chosen       : rgba(#fff, .2),
 
 
   solarized_dark_header_head_neutral   : rgba(#859900, .35),
@@ -87,16 +87,16 @@ $colors: (
   solarized_dark_line_head_chosen      : rgba(#859900, .35),
   solarized_dark_button_head_chosen    : #39800d,
 
-  solarized_dark_header_origin_neutral : rgba(#2878C9, .35),
-  solarized_dark_line_origin_neutral   : rgba(#2878C9, .15),
+  solarized_dark_header_origin_neutral : rgba(#2878c9, .35),
+  solarized_dark_line_origin_neutral   : rgba(#2878c9, .15),
   solarized_dark_button_origin_neutral : #086799,
 
-  solarized_dark_header_origin_chosen  : rgba(#2878C9, .6),
-  solarized_dark_line_origin_chosen    : rgba(#2878C9, .35),
-  solarized_dark_button_origin_chosen  : #0082CC,
+  solarized_dark_header_origin_chosen  : rgba(#2878c9, .6),
+  solarized_dark_line_origin_chosen    : rgba(#2878c9, .35),
+  solarized_dark_button_origin_chosen  : #0082cc,
 
-  solarized_dark_header_not_chosen     : rgba(#FFF, .25),
-  solarized_dark_line_not_chosen       : rgba(#FFF, .15)
+  solarized_dark_header_not_chosen     : rgba(#fff, .25),
+  solarized_dark_line_not_chosen       : rgba(#fff, .15)
 );
 
 
@@ -190,6 +190,6 @@ $colors: (
   }
 
   .btn-success .fa-spinner {
-    color: #FFF;
+    color: #fff;
   }
 }