The page's end: 32/24 px, then the footer (plan 280) (#187)

ddiff --git a/public/css/exchange.css b/public/css/exchange.css
iindex 1d284ff..d295c62 100644
---- a/public/css/exchange.css
++++ b/public/css/exchange.css
@@@ -10,7 +10,7 @@
  .skip:focus { left: 12px; top: 12px; z-index: 99; padding: 8px 12px; border-radius: 10px; background: var(--ovk-panel); color: inherit; }
  
  /* One container: the content, and the head's text, start on the same line at every width. */
--.ex-wrap { width: 100%; max-width: var(--ex-max); margin: 0 auto; padding: 0 16px 28px; }
++.ex-wrap { width: 100%; max-width: var(--ex-max); margin: 0 auto; padding: 0 16px; }
  .ex-narrow { max-width: 760px; }
  .ex-page { padding-top: 10px; }
  .ex-muted { color: var(--ovk-muted); }
ddiff --git a/public/css/platform.css b/public/css/platform.css
iindex 9f0f696..5224eee 100644
---- a/public/css/platform.css
++++ b/public/css/platform.css
@@@ -1,5 +1,5 @@
  .xp {
--    padding-block: 40px;
++    padding-block: 40px 0;
      display: grid;
      gap: 28px;
  }
@@@ -85,7 +85,7 @@
  }
  @media (max-width: 700px) {
      .xp {
--        padding-block: 24px;
++        padding-block: 24px 0;
      }
      .xp-reasons,
      .xp-search-results {