Bootstrap 5 Button Hover Effects

<section class="wdw-stage">
  <div class="container" style="max-width:1100px">
    <div class="text-center mb-5">
      <span class="wdw-eyebrow">Buttons</span>
      <h1 class="wdw-heading display-6 mt-2 mb-2">Button hover effects</h1>
      <p class="wdw-muted mb-0">Five CSS-only hover styles. Hover or focus each one.</p>
    </div>
    <div class="wdw-aurora rounded-4 p-4 p-lg-5">
      <div class="row row-cols-2 row-cols-md-3 row-cols-lg-5 g-4 text-center justify-content-center">
        <div class="col"><button type="button" class="btn btn-outline-light rounded-pill w-100 fx fx-glow">Glow</button><div class="small text-white-50 mt-3">Inset halo</div></div>
        <div class="col"><button type="button" class="btn btn-outline-light rounded-pill w-100 fx fx-fill">Fill</button><div class="small text-white-50 mt-3">Sliding fill</div></div>
        <div class="col"><button type="button" class="btn btn-primary rounded-pill w-100 fx fx-lift">Lift</button><div class="small text-white-50 mt-3">Raised shadow</div></div>
        <div class="col"><button type="button" class="btn btn-outline-primary rounded-pill w-100 fx fx-pulse">Pulse</button><div class="small text-white-50 mt-3">Soft ring</div></div>
        <div class="col"><button type="button" class="btn btn-primary rounded-pill w-100 fx fx-shine">Shine</button><div class="small text-white-50 mt-3">Light sweep</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 */
.fx { position: relative; overflow: hidden; transition: all .3s ease; }
.fx-glow:hover, .fx-glow:focus-visible { box-shadow: inset 0 0 14px rgba(255,255,255,.35), 0 0 20px rgba(129,140,248,.8); }
.fx-fill { z-index: 0; }
.fx-fill::before { content: ""; position: absolute; inset: 0; background: #fff; transform: translateX(-101%); transition: transform .35s ease; z-index: -1; }
.fx-fill:hover, .fx-fill:focus-visible { color: #1e1b4b; background: transparent; }
.fx-fill:hover::before, .fx-fill:focus-visible::before { transform: none; }
.fx-lift:hover, .fx-lift:focus-visible { transform: translateY(-3px); box-shadow: 0 14px 22px -8px rgba(129,140,248,.9); }
.fx-pulse { --bs-btn-color: #fff; --bs-btn-border-color: #a5b4fc; --bs-btn-bg: rgba(255,255,255,.08); --bs-btn-hover-bg: rgba(255,255,255,.08); --bs-btn-hover-color: #fff; --bs-btn-hover-border-color: #fff; }
.fx-pulse::after { content: ""; position: absolute; top: 50%; right: 1rem; width: .5rem; height: .5rem; margin-top: -.25rem; border-radius: 50%; background: #a5b4fc; }
.fx-pulse:hover, .fx-pulse:focus-visible { animation: fxPulse 1.2s infinite; }
@keyframes fxPulse { 0% { box-shadow: 0 0 0 0 rgba(165,180,252,.7); } 100% { box-shadow: 0 0 0 14px rgba(165,180,252,0); } }
.fx-shine::before { content: ""; position: absolute; top: 0; left: -80%; width: 50%; height: 100%; background: linear-gradient(100deg, transparent, rgba(255,255,255,.5), transparent); transform: skewX(-20deg); }
.fx-shine:hover::before, .fx-shine:focus-visible::before { left: 130%; transition: left .6s ease; }
@media (prefers-reduced-motion: reduce) { .fx, .fx::before, .fx::after { transition: none; animation: none !important; } }