Changed colors to match GitLab's red & green and softened the yellow.

app/assets/stylesheets/sections/profile.scss

@@ -118,13 +118,13 @@
 }
 
 .has-success input {
-  background-color: #C3FF88 !important;
+  background-color: #D6F1D7 !important;
 }
 
 .has-error input {
-  background-color: #FFA0A0 !important;
+  background-color: #F3CECE !important;
 }
 
 .has-warning input {
-  background-color: #FFEC8B !important;
+  background-color: #FFE9A4 !important;
 }