extjs/classic/theme-neutral/sass/src/form/field/Date.scss

   1 .#{$prefix}form-field-date {
   2     .#{$prefix}form-date-trigger {
   3         @if $enable-font-icons and ($form-date-trigger-glyph != null) {
   4             @include font-icon($form-date-trigger-glyph, $line-height: null);
   5         } @else {
   6             background-image: theme-background-image('form/date-trigger');
   7
   8             @if $include-rtl {
   9                 &.#{$prefix}rtl {
  10                     background-image: theme-background-image('form/date-trigger-rtl');
  11                 }
  12             }
  13         }
  14     }
  15 }