Fix positioning of StreamField and rich text "add" toggle buttons

client/src/components/Draftail/Draftail.scss

@@ -172,7 +172,7 @@ $draftail-editor-font-family: $font-sans;
   color: theme('colors.secondary.DEFAULT');
   width: theme('spacing.4');
   height: theme('spacing.4');
-  margin-inline-end: theme('spacing.1');
+  margin-inline-end: 1px;
 
   @include media-breakpoint-up(sm) {
     width: theme('spacing.5');

client/src/components/StreamField/scss/components/c-sf-add-button.scss

@@ -13,7 +13,7 @@
   pointer-events: none;
   border: 1px solid currentColor;
   border-radius: theme('borderRadius.full');
-  margin-inline-start: theme('spacing.[0.5]');
+  margin-inline-start: -1px;
 
   .icon {
     width: theme('spacing.3');