fix button size for screens between desktop and md

assets/sass/_theme/sections/diplomas.sass

@@ -135,8 +135,12 @@ ul.diplomas
             flex-direction: column
             gap: $spacing-3
             --btn-min-width: #{columns(2)}
+            button, > a
+                max-width: columns(3)
+        @include media-breakpoint-up(xl)
             button, > a
                 max-width: columns(2)
+                width: columns(2)
         @include media-breakpoint-down(desktop)
             margin-top: $spacing-3
     .container