Bootstrap 5 Sliding Sign In and Sign Up Form
A sign in and sign up card where a gradient panel slides between two forms on desktop and a segmented switch toggles them on mobile.
<section class="wdw-stage">
<div class="container" style="max-width:920px">
<div class="wdw-auth wdw-card overflow-hidden" id="wdwAuth" data-mode="signin">
<!-- Mobile segmented switch -->
<div class="wdw-auth-switch d-md-none p-3 pb-0">
<div class="btn-group w-100" role="group" aria-label="Choose form">
<input type="radio" class="btn-check" name="wdwMode" id="wdwModeIn" autocomplete="off" checked>
<label class="btn btn-outline-primary rounded-start-pill" for="wdwModeIn">Sign in</label>
<input type="radio" class="btn-check" name="wdwMode" id="wdwModeUp" autocomplete="off">
<label class="btn btn-outline-primary rounded-end-pill" for="wdwModeUp">Sign up</label>
</div>
</div>
<form class="wdw-pane wdw-pane-in p-4 p-lg-5" action="#" id="wdwSignIn">
<h1 class="wdw-heading h3 mb-1">Welcome back</h1>
<p class="wdw-muted mb-4">Sign in to pick up where you left off.</p>
<div class="form-floating mb-3">
<input type="email" class="form-control" id="inEmail" placeholder="[email protected]" autocomplete="email" required>
<label for="inEmail">Email address</label>
</div>
<div class="form-floating mb-2">
<input type="password" class="form-control" id="inPass" placeholder="Password" autocomplete="current-password" required>
<label for="inPass">Password</label>
</div>
<div class="d-flex justify-content-between align-items-center mb-4 small">
<div class="form-check mb-0"><input class="form-check-input" type="checkbox" id="inRemember"><label class="form-check-label" for="inRemember">Remember me</label></div>
<a href="#" class="link-primary link-underline-opacity-0 fw-semibold">Forgot password?</a>
</div>
<button class="btn btn-primary rounded-pill w-100" type="submit">Sign in</button>
</form>
<form class="wdw-pane wdw-pane-up p-4 p-lg-5" action="#" id="wdwSignUp">
<h2 class="wdw-heading h3 mb-1">Create your account</h2>
<p class="wdw-muted mb-4">Free for 14 days. No card needed.</p>
<div class="form-floating mb-3">
<input type="text" class="form-control" id="upName" placeholder="Full name" autocomplete="name" required>
<label for="upName">Full name</label>
</div>
<div class="form-floating mb-3">
<input type="email" class="form-control" id="upEmail" placeholder="[email protected]" autocomplete="email" required>
<label for="upEmail">Email address</label>
</div>
<div class="form-floating mb-4">
<input type="password" class="form-control" id="upPass" placeholder="Password" autocomplete="new-password" minlength="8" required>
<label for="upPass">Password (8+ characters)</label>
</div>
<button class="btn btn-primary rounded-pill w-100" type="submit">Create account</button>
</form>
<div class="wdw-overlay wdw-aurora d-none d-md-flex" aria-hidden="false">
<div class="wdw-ov wdw-ov-in text-center">
<h2 class="fw-bold mb-2">New here?</h2>
<p class="mb-4 opacity-75">Create an account and start in under a minute.</p>
<button class="btn btn-light rounded-pill px-4" type="button" data-mode-go="signup">Sign up</button>
</div>
<div class="wdw-ov wdw-ov-up text-center">
<h2 class="fw-bold mb-2">Already a member?</h2>
<p class="mb-4 opacity-75">Sign in with your details to continue.</p>
<button class="btn btn-light rounded-pill px-4" type="button" data-mode-go="signin">Sign in</button>
</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 */
.wdw-auth { position: relative; }
.wdw-pane { display: none; }
.wdw-auth[data-mode="signin"] .wdw-pane-in, .wdw-auth[data-mode="signup"] .wdw-pane-up { display: block; }
.wdw-ov { display: none; }
.wdw-auth[data-mode="signin"] .wdw-ov-in, .wdw-auth[data-mode="signup"] .wdw-ov-up { display: block; }
@media (min-width: 768px) {
.wdw-auth { min-height: 520px; }
.wdw-auth { display: grid; grid-template-columns: 1fr 1fr; }
.wdw-pane { display: flex !important; flex-direction: column; justify-content: center; transition: opacity .35s ease .15s; }
.wdw-pane-in { grid-column: 1; grid-row: 1; }
.wdw-pane-up { grid-column: 2; grid-row: 1; }
.wdw-auth[data-mode="signin"] .wdw-pane-up, .wdw-auth[data-mode="signup"] .wdw-pane-in { opacity: 0; pointer-events: none; visibility: hidden; transition: opacity .2s, visibility 0s .35s; }
.wdw-overlay { position: absolute; top: 0; bottom: 0; left: 50%; width: 50%; align-items: center; justify-content: center; padding: 2.5rem; transition: transform .6s cubic-bezier(.65, 0, .35, 1); z-index: 2; }
.wdw-auth[data-mode="signup"] .wdw-overlay { transform: translateX(-100%); }
.wdw-ov .btn { color: #1e1b4b; }
}
@media (prefers-reduced-motion: reduce) { .wdw-overlay, .wdw-pane { transition: none !important; } }
(function initAuthSwitch() {
var root = document.getElementById('wdwAuth');
if (!root) return;
var radios = root.querySelectorAll('input[name="wdwMode"]');
function setMode(mode) {
root.dataset.mode = mode;
radios.forEach(function (r) { r.checked = (r.id === 'wdwModeUp') === (mode === 'signup'); });
var first = root.querySelector(mode === 'signup' ? '#upName' : '#inEmail');
if (first && window.matchMedia('(min-width: 768px)').matches) setTimeout(function () { first.focus({ preventScroll: true }); }, 450);
}
root.querySelectorAll('[data-mode-go]').forEach(function (b) {
b.addEventListener('click', function () { setMode(b.dataset.modeGo); });
});
radios.forEach(function (r) {
r.addEventListener('change', function () { setMode(r.id === 'wdwModeUp' ? 'signup' : 'signin'); });
});
root.querySelectorAll('form').forEach(function (f) {
f.addEventListener('submit', function (e) { e.preventDefault(); });
});
})();
Built on Bootstrap 5.3.8 with plain JavaScript — no jQuery. Supports light and dark mode via data-bs-theme.