Bootstrap 5 Registration Form with Animated Background

<section class="reg wdw-aurora d-flex align-items-center">
  <canvas class="reg-bg" aria-hidden="true"></canvas>
  <div class="container position-relative py-5" style="max-width:1080px">
    <div class="row align-items-center g-5">
      <div class="col-lg-6">
        <span class="badge rounded-pill text-bg-light mb-3">Free for 14 days</span>
        <h1 class="display-5 fw-bold mb-3" style="letter-spacing:-.02em">Build something people love, together.</h1>
        <p class="lead mb-4" style="opacity:.8">Create your workspace in under a minute. No credit card, no setup call, cancel anytime.</p>
        <ul class="list-unstyled d-grid gap-2 mb-0" style="opacity:.9">
          <li class="d-flex gap-2 align-items-center"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m5 12 5 5 9-10"/></svg>Unlimited projects</li>
          <li class="d-flex gap-2 align-items-center"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m5 12 5 5 9-10"/></svg>Real-time collaboration</li>
          <li class="d-flex gap-2 align-items-center"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m5 12 5 5 9-10"/></svg>Priority support</li>
        </ul>
      </div>
      <div class="col-lg-6">
        <form class="wdw-card p-4 p-md-5 text-body needs-validation" novalidate>
          <h2 class="h4 wdw-heading mb-1">Create your account</h2>
          <p class="wdw-muted small mb-4">Already registered? <a href="#" class="fw-semibold">Sign in</a></p>
          <div class="form-floating mb-3"><input type="text" class="form-control" id="regName" placeholder="Full name" required autocomplete="name"><label for="regName">Full name</label><div class="invalid-feedback">Please enter your name.</div></div>
          <div class="form-floating mb-3"><input type="email" class="form-control" id="regEmail" placeholder="Email" required autocomplete="email"><label for="regEmail">Email address</label><div class="invalid-feedback">Enter a valid email.</div></div>
          <div class="form-floating mb-3"><input type="text" class="form-control" id="regUser" placeholder="Username" required autocomplete="username"><label for="regUser">Username</label><div class="invalid-feedback">Choose a username.</div></div>
          <div class="form-floating mb-4"><input type="password" class="form-control" id="regPass" placeholder="Password" required minlength="8" autocomplete="new-password"><label for="regPass">Password</label><div class="invalid-feedback">Use at least 8 characters.</div></div>
          <button type="submit" class="btn btn-primary rounded-pill w-100">Create account</button>
          <p class="wdw-muted small text-center mt-3 mb-0" role="status" aria-live="polite" id="regStatus"></p>
        </form>
      </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 */
.reg { position: relative; min-height: 100vh; overflow: hidden; }
.reg-bg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }

function initParticles() {
  const canvas = document.querySelector('.reg-bg');
  if (!canvas) return;
  const ctx = canvas.getContext('2d');
  const reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  let w = 0, h = 0, pts = [];
  function resize() {
    const r = canvas.getBoundingClientRect();
    w = canvas.width = r.width; h = canvas.height = r.height;
    const n = Math.max(24, Math.min(70, Math.round(w * h / 18000)));
    pts = Array.from({ length: n }, () => ({ x: Math.random() * w, y: Math.random() * h, vx: (Math.random() - .5) * .4, vy: (Math.random() - .5) * .4 }));
  }
  function draw() {
    ctx.clearRect(0, 0, w, h);
    for (const p of pts) {
      if (!reduce) { p.x += p.vx; p.y += p.vy; if (p.x < 0 || p.x > w) p.vx *= -1; if (p.y < 0 || p.y > h) p.vy *= -1; }
      ctx.fillStyle = 'rgba(255,255,255,.7)'; ctx.beginPath(); ctx.arc(p.x, p.y, 1.5, 0, 6.283); ctx.fill();
    }
    for (let i = 0; i < pts.length; i++) for (let j = i + 1; j < pts.length; j++) {
      const d = Math.hypot(pts[i].x - pts[j].x, pts[i].y - pts[j].y);
      if (d < 120) { ctx.strokeStyle = 'rgba(255,255,255,' + (0.25 * (1 - d / 120)) + ')'; ctx.beginPath(); ctx.moveTo(pts[i].x, pts[i].y); ctx.lineTo(pts[j].x, pts[j].y); ctx.stroke(); }
    }
    if (!reduce) requestAnimationFrame(draw);
  }
  resize(); draw();
  window.addEventListener('resize', () => { resize(); if (reduce) draw(); });
}
function initRegForm() {
  const form = document.querySelector('.reg form');
  if (!form) return;
  form.addEventListener('submit', (e) => {
    e.preventDefault();
    form.classList.add('was-validated');
    if (!form.checkValidity()) return;
    document.getElementById('regStatus').textContent = 'Account created. Check your inbox to confirm.';
  });
}
initParticles();
initRegForm();