The passport stamp's small line reads (#47)

ddiff --git a/public/css/exchange.css b/public/css/exchange.css
iindex 84f4450..c2e07d9 100644
---- a/public/css/exchange.css
++++ b/public/css/exchange.css
@@@ -72,7 +72,7 @@ html.ov-motion .ex-motif-arrows path { stroke-dasharray: 500; animation: ex-loop
  .ex-motif-item { position: absolute; padding: 9px 14px; border-radius: 12px; font-size: .86rem; font-weight: 800; background: var(--bg-card, #0f1729); border: 1px solid color-mix(in srgb, var(--room-accent) 45%, var(--border, #1f2d47)); color: var(--text-primary, #e6edf7); box-shadow: 0 8px 22px rgba(0, 0, 0, .22); }
  .ex-motif-item-a { left: 4%; top: 18%; } .ex-motif-item-b { right: 4%; top: 18%; }
  .ex-motif-passport { position: absolute; left: 50%; bottom: 8%; translate: -50% 0; display: grid; justify-items: center; padding: 10px 18px; border-radius: 14px; background: var(--room-fill); color: var(--room-on); rotate: -4deg; box-shadow: 0 10px 26px rgba(0, 0, 0, .28); }
--.ex-motif-passport small { font-size: .68rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; opacity: .8; }
++.ex-motif-passport small { font-size: .68rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; opacity: .95; }
  .ex-motif-passport b { font-size: 1.3rem; letter-spacing: .06em; text-transform: uppercase; }
  html.ov-motion .ex-motif-passport { animation: ex-stamp .5s cubic-bezier(.2,.9,.3,1.4) 1.2s both; }
  @keyframes ex-stamp { from { opacity: 0; scale: 1.6; } }
ddiff --git a/test/contrast.test.js b/test/contrast.test.js
nnew file mode 100644
iindex 0000000..332a15f
---- /dev/null
++++ b/test/contrast.test.js
@@@ -0,0 +1,14 @@
++'use strict';
++// WCAG 2.1 AA: the passport stamp's small line was 3.8:1 at .8 opacity. It now sits at .95.
++//   node test/contrast.test.js
++const assert = require('assert');
++const fs = require('fs');
++const path = require('path');
++
++const css = fs.readFileSync(path.join(__dirname, '..', 'public', 'css', 'exchange.css'), 'utf8');
++assert.ok(
++    css.includes('.ex-motif-passport small { font-size: .68rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; opacity: .95; }'),
++    'the passport small line is .95, not .8'
++);
++assert.ok(!css.includes('.ex-motif-passport small { font-size: .68rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; opacity: .8; }'), 'the .8 stamp line is gone');
++console.log('contrast: the passport stamp reads');