fix(interruption card): fix body text color when govuk-global-styles …

…is true (#1059)

If the component is used when govuk global styles is set to true, the i
specificity isn't high enough to override the text color to white.
This commit adds extra css to ensure elements within the interruption
card body are given the correct text size and color.

src/moj/components/interruption-card/_interruption-card.scss

@@ -14,6 +14,13 @@
   color: govuk-colour("white");
 }
 
+// If $govuk-global-styles is true, we need to override the color and size on elements
+// within the body class directly
+.moj-interruption-card__body > * {
+  @include govuk-font-size($size: 24);
+  color: govuk-colour("white");
+}
+
 .moj-interruption-card__body:last-child {
   margin-bottom: 0;
 }