Carousel variables (#29493)

Author: leshasmp

scss/_carousel.scss

@@ -188,10 +188,10 @@
 .carousel-caption {
   position: absolute;
   right: (100% - $carousel-caption-width) / 2;
-  bottom: 20px;
+  bottom: $carousel-caption-spacer;
   left: (100% - $carousel-caption-width) / 2;
-  padding-top: 20px;
-  padding-bottom: 20px;
+  padding-top: $carousel-caption-padding-y;
+  padding-bottom: $carousel-caption-padding-y;
   color: $carousel-caption-color;
   text-align: center;
 }

scss/_variables.scss

@@ -1080,6 +1080,8 @@ $carousel-indicator-transition:      opacity .6s ease !default;
 
 $carousel-caption-width:             70% !default;
 $carousel-caption-color:             $white !default;
+$carousel-caption-padding-y:         1.25rem !default;
+$carousel-caption-spacer:            1.25rem !default;
 
 $carousel-control-icon-width:        20px !default;