Fix center state for arrow in collapse (#509)

Co-authored-by: Stefan Popov <[email protected]>

Author: stefashkaa

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@soramitsu/soramitsu-js-ui",
-  "version": "1.0.43",
+  "version": "1.0.44",
   "private": false,
   "publishConfig": {
     "registry": "https://nexus.iroha.tech/repository/npm-soramitsu/"

src/styles/collapse.scss

@@ -36,6 +36,9 @@
       &::before {
         position: absolute;
         transition: transform 0.25s ease-in-out;
+        display: flex;
+        justify-content: center;
+        align-items: center;
       }
       @extend .s-icon-chevron-down-rounded-16;
       font-size: var(--s-icon-font-size-mini);