An alternative (better) attempt to fix the mobile layout

Author: birdofpreyru

.browserslistrc

@@ -1 +1 @@
-> 5%
+> 1%, last 2 versions, Firefox ESR

src/shared/components/challenge-detail/Header/style.scss

@@ -146,10 +146,6 @@
       flex-wrap: wrap;
       align-items: stretch;
 
-      @include xxs-to-xs {
-        flex-direction: column;
-      }
-
       .prizes-outer-container {
         flex: 4;
 

src/shared/components/challenge-detail/Specification/styles.scss

@@ -30,10 +30,6 @@ $tc-link-visited: #0c4e98;
   align-items: baseline;
   word-break: break-word;
 
-  @include xxs-to-xs {
-    flex-direction: column;
-  }
-
   .challenge-specifications {
     flex: 4;
     text-align: left;