ISTWCMS-5650: Style buttons <> icons to match

src/patterns/04-components/image-gallery/_image-gallery.scss

@@ -67,10 +67,10 @@ $size-xlarge: 7;
     }
     .flickity-button-icon {
       position: absolute;
-      top: 35%;
+      top: 40%;
       left: inherit;
-      height: var(--size-2);
-      width: var(--size-2);
+      height: var(--size-110);
+      width: var(--size-110);
     }
     &.hide {
       display: none;
@@ -78,7 +78,7 @@ $size-xlarge: 7;
     &.next {
       left:49.5%;
       .flickity-button-icon {
-        left: 3.5rem;
+        left: 3.25rem;
       }
      &:before {
        width: var(--size-10);
@@ -92,7 +92,7 @@ $size-xlarge: 7;
       left: 42%;
       .flickity-button-icon {
         left: inherit;
-        left: 15%;
+        left: 20%;
       }
       &:before {
         width: var(--size-10);