Bootstrap 5 Newsletter Signup Form with Discount Coupon

<section class="wdw-stage">
  <div class="container" style="max-width: 880px">
    <div class="wdw-card overflow-hidden" id="couponCard">
      <div class="row g-0">
        <div class="col-md-5 wdw-aurora p-4 p-md-5 d-flex flex-column justify-content-center text-center text-md-start">
          <span class="wdw-eyebrow text-white-50">Welcome offer</span>
          <p class="coupon-big mb-1 mt-2" aria-label="10 percent off">10<span>% off</span></p>
          <p class="mb-0 opacity-75">your first order, just for joining.</p>
        </div>
        <div class="col-md-7 p-4 p-md-5">
          <div id="couponForm">
            <h1 class="h3 wdw-heading mb-2">Get 10% off today</h1>
            <p class="wdw-muted mb-4">Subscribe to our newsletter and we will send your coupon straight away.</p>
            <form id="couponSubscribe" novalidate>
              <div class="form-floating mb-3">
                <input type="email" class="form-control" id="couponEmail" placeholder="[email protected]" required autocomplete="email">
                <label for="couponEmail">Email address</label>
                <div class="invalid-feedback">Please enter a valid email address.</div>
              </div>
              <button type="submit" class="btn btn-primary rounded-pill w-100">Get my coupon</button>
            </form>
            <div class="d-flex justify-content-between align-items-center mt-3 small">
              <button type="button" class="btn btn-link btn-sm text-body-secondary text-decoration-none p-0" id="couponDismiss">No thanks</button>
              <span class="wdw-muted">* $50 minimum purchase</span>
            </div>
          </div>

          <div id="couponDone" hidden class="text-center text-md-start">
            <span class="wdw-icon mb-3"><svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M20 6 9 17l-5-5"/></svg></span>
            <h2 class="h3 wdw-heading mb-2">You are in!</h2>
            <p class="wdw-muted mb-3">Use this code at checkout. We also emailed it to <strong id="couponSentTo" class="text-body-emphasis"></strong>.</p>
            <div class="input-group mb-2">
              <input type="text" class="form-control text-center fw-bold coupon-code" id="couponCode" value="WELCOME10" readonly aria-label="Coupon code">
              <button class="btn btn-outline-primary" type="button" id="couponCopy">Copy</button>
            </div>
            <p class="small wdw-muted mb-0" role="status" id="couponCopied"> </p>
          </div>

          <div id="couponClosed" hidden class="text-center py-4">
            <p class="wdw-muted mb-3">No problem. The offer will be here if you change your mind.</p>
            <button type="button" class="btn btn-outline-primary rounded-pill" id="couponReopen">Show offer again</button>
          </div>
        </div>
      </div>
    </div>
  </div>
</section>

/* Web Designer Wall library style — shared base for every Bootstrap 5 snippet.
   Indigo accent, Plus Jakarta Sans, soft cards, pill buttons. Works in light and dark. */
@import url("https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap");

:root,
[data-bs-theme="light"] {
  --wdw-font: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --bs-body-font-family: var(--wdw-font);
  --bs-primary: #4f46e5;
  --bs-primary-rgb: 79, 70, 229;
  --bs-primary-text-emphasis: #3730a3;
  --bs-primary-bg-subtle: #eef2ff;
  --bs-primary-border-subtle: #c7d2fe;
  --bs-link-color: #4f46e5;
  --bs-link-color-rgb: 79, 70, 229;
  --bs-link-hover-color: #4338ca;
  --bs-link-hover-color-rgb: 67, 56, 202;
  --bs-focus-ring-color: rgba(79, 70, 229, 0.25);
  --bs-border-radius: 0.75rem;
  --bs-border-radius-lg: 1rem;
  --bs-border-radius-xl: 1.25rem;
  --wdw-radius-card: 1.25rem;
  --wdw-shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 16px 40px -16px rgba(16, 24, 40, 0.22);
  --wdw-shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06), 0 4px 12px -4px rgba(16, 24, 40, 0.12);
  --wdw-stage: #f5f6fb;
}

[data-bs-theme="dark"] {
  --bs-primary: #818cf8;
  --bs-primary-rgb: 129, 140, 248;
  --bs-primary-text-emphasis: #c7d2fe;
  --bs-primary-bg-subtle: rgba(129, 140, 248, 0.14);
  --bs-primary-border-subtle: rgba(129, 140, 248, 0.35);
  --bs-link-color: #a5b4fc;
  --bs-link-color-rgb: 165, 180, 252;
  --bs-link-hover-color: #c7d2fe;
  --bs-link-hover-color-rgb: 199, 210, 254;
  --bs-focus-ring-color: rgba(129, 140, 248, 0.35);
  --wdw-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 16px 40px -16px rgba(0, 0, 0, 0.7);
  --wdw-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 12px -4px rgba(0, 0, 0, 0.5);
  --wdw-stage: #0f1117;
}

body { font-family: var(--wdw-font); -webkit-font-smoothing: antialiased; }

/* Bootstrap compiles its blue into these components; point them at the accent. */
.btn-primary {
  --bs-btn-bg: var(--bs-primary); --bs-btn-border-color: var(--bs-primary);
  --bs-btn-hover-bg: #4338ca; --bs-btn-hover-border-color: #4338ca;
  --bs-btn-active-bg: #3730a3; --bs-btn-active-border-color: #3730a3;
  --bs-btn-disabled-bg: var(--bs-primary); --bs-btn-disabled-border-color: var(--bs-primary);
  --bs-btn-focus-shadow-rgb: var(--bs-primary-rgb);
}
[data-bs-theme="dark"] .btn-primary { --bs-btn-color: #0f1117; --bs-btn-hover-bg: #a5b4fc; --bs-btn-hover-border-color: #a5b4fc; --bs-btn-hover-color: #0f1117; --bs-btn-active-color: #0f1117; }
.btn-outline-primary {
  --bs-btn-color: var(--bs-primary); --bs-btn-border-color: var(--bs-primary);
  --bs-btn-hover-bg: var(--bs-primary); --bs-btn-hover-border-color: var(--bs-primary);
  --bs-btn-active-bg: var(--bs-primary); --bs-btn-active-border-color: var(--bs-primary);
  --bs-btn-focus-shadow-rgb: var(--bs-primary-rgb);
}
.btn { --bs-btn-font-weight: 600; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: .5rem; }
.btn-sm { min-height: 36px; }
.form-control, .form-select { min-height: 44px; border-radius: .75rem; }
.form-control:focus, .form-select:focus, .form-check-input:focus { border-color: rgba(var(--bs-primary-rgb), .6); box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.form-check-input:checked { background-color: var(--bs-primary); border-color: var(--bs-primary); }
.nav-pills { --bs-nav-pills-link-active-bg: var(--bs-primary); }
.nav { --bs-nav-link-color: var(--bs-secondary-color); --bs-nav-link-hover-color: var(--bs-emphasis-color); }
.pagination { --bs-pagination-active-bg: var(--bs-primary); --bs-pagination-active-border-color: var(--bs-primary); --bs-pagination-color: var(--bs-body-color); --bs-pagination-focus-box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.progress, .progress-stacked { --bs-progress-bar-bg: var(--bs-primary); }
.list-group { --bs-list-group-active-bg: var(--bs-primary); --bs-list-group-active-border-color: var(--bs-primary); }
.dropdown-menu { --bs-dropdown-link-active-bg: var(--bs-primary); border-radius: .875rem; box-shadow: var(--wdw-shadow-sm); }
.accordion { --bs-accordion-active-bg: var(--bs-primary-bg-subtle); --bs-accordion-active-color: var(--bs-primary-text-emphasis); --bs-accordion-btn-focus-box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.badge { font-weight: 600; }

/* Library building blocks — use these instead of re-inventing them per snippet. */
.wdw-stage { min-height: 100vh; display: flex; align-items: center; background: var(--wdw-stage); padding-block: 3rem; }
.wdw-card { background: var(--bs-body-bg); border: 1px solid var(--bs-border-color-translucent); border-radius: var(--wdw-radius-card); box-shadow: var(--wdw-shadow); }
.wdw-card-sm { background: var(--bs-body-bg); border: 1px solid var(--bs-border-color-translucent); border-radius: 1rem; box-shadow: var(--wdw-shadow-sm); }
.wdw-aurora { position: relative; color: #fff; background: radial-gradient(60% 55% at 100% 0, #818cf8 0, transparent 70%), radial-gradient(65% 60% at 0 100%, #ec4899 0, transparent 65%), #1e1b4b; }
.wdw-eyebrow { display: inline-block; font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--bs-primary); }
.wdw-heading { font-weight: 800; letter-spacing: -.02em; color: var(--bs-emphasis-color); }
.wdw-muted { color: var(--bs-secondary-color); }
.wdw-icon { width: 2.75rem; height: 2.75rem; flex: none; display: inline-flex; align-items: center; justify-content: center; border-radius: .875rem; background: var(--bs-primary-bg-subtle); color: var(--bs-primary); }

/* Component */
.coupon-big { font-size: clamp(4rem, 9vw, 5.5rem); font-weight: 800; letter-spacing: -.04em; line-height: 1; }
.coupon-big span { font-size: .38em; letter-spacing: 0; margin-left: .15em; text-transform: uppercase; }
.coupon-code { letter-spacing: .15em; font-size: 1.1rem; }

(function () {
  function initCoupon() {
    var form = document.getElementById('couponSubscribe');
    if (!form) return;
    var email = document.getElementById('couponEmail');
    var panes = { form: document.getElementById('couponForm'), done: document.getElementById('couponDone'), closed: document.getElementById('couponClosed') };
    function show(name) { Object.keys(panes).forEach(function (k) { panes[k].hidden = k !== name; }); }

    form.addEventListener('submit', function (e) {
      e.preventDefault();
      var ok = email.checkValidity() && email.value.trim() !== '';
      email.classList.toggle('is-invalid', !ok);
      if (!ok) return email.focus();
      document.getElementById('couponSentTo').textContent = email.value.trim();
      show('done');
    });
    email.addEventListener('input', function () { email.classList.remove('is-invalid'); });
    document.getElementById('couponDismiss').addEventListener('click', function () { show('closed'); });
    document.getElementById('couponReopen').addEventListener('click', function () { show('form'); });

    document.getElementById('couponCopy').addEventListener('click', function () {
      var code = document.getElementById('couponCode');
      var note = document.getElementById('couponCopied');
      code.select();
      var done = function () { note.textContent = 'Copied to clipboard'; };
      if (navigator.clipboard) navigator.clipboard.writeText(code.value).then(done, done);
      else { try { document.execCommand('copy'); } catch (err) {} done(); }
    });
  }
  initCoupon();
})();