Bootstrap 5 Buttons with CSS Hover Effects

<section class="wdw-stage">
<div class="container" style="max-width:720px">
<div class="text-center mb-4"><span class="wdw-eyebrow">Buttons</span><h2 class="wdw-heading h2 mb-1">Six hover effects, zero JavaScript</h2><p class="wdw-muted mb-0">Bootstrap buttons plus one modifier class each. Hover or focus to try them.</p></div>
<div class="wdw-card px-4 py-2">
<div class="fx-row d-flex align-items-center justify-content-between gap-3 py-3"><div class="wdw-min0"><div class="fw-semibold text-body-emphasis">Slide fill</div><div class="small wdw-muted">Colour wipes in from the left</div></div><button type="button" class="btn btn-outline-primary rounded-pill fx fx-fill">Slide fill</button></div>
<div class="fx-row d-flex align-items-center justify-content-between gap-3 py-3 border-top"><div class="wdw-min0"><div class="fw-semibold text-body-emphasis">Lift</div><div class="small wdw-muted">Rises with a coloured shadow</div></div><button type="button" class="btn rounded-pill fx fx-lift">Lift</button></div>
<div class="fx-row d-flex align-items-center justify-content-between gap-3 py-3 border-top"><div class="wdw-min0"><div class="fw-semibold text-body-emphasis">Shine</div><div class="small wdw-muted">A highlight sweeps across</div></div><button type="button" class="btn rounded-pill fx fx-shine">Shine</button></div>
<div class="fx-row d-flex align-items-center justify-content-between gap-3 py-3 border-top"><div class="wdw-min0"><div class="fw-semibold text-body-emphasis">Arrow</div><div class="small wdw-muted">Icon slides forward</div></div><button type="button" class="btn btn-outline-secondary rounded-pill fx fx-arrow">Continue <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M5 12h14M13 6l6 6-6 6"/></svg></button></div>
<div class="fx-row d-flex align-items-center justify-content-between gap-3 py-3 border-top"><div class="wdw-min0"><div class="fw-semibold text-body-emphasis">Glow ring</div><div class="small wdw-muted">A soft halo blooms outward</div></div><button type="button" class="btn rounded-pill fx fx-ring is-hover">Glow ring</button></div>
<div class="fx-row d-flex align-items-center justify-content-between gap-3 py-3 border-top"><div class="wdw-min0"><div class="fw-semibold text-body-emphasis">Press</div><div class="small wdw-muted">3D key that sinks when clicked</div></div><button type="button" class="btn btn-primary rounded-pill fx fx-press">Press</button></div>
<div class="fx-row d-flex align-items-center justify-content-between gap-3 py-3 border-top"><div class="wdw-min0"><div class="fw-semibold text-body-emphasis">Disabled</div><div class="small wdw-muted">Effects switch off</div></div><button type="button" class="btn btn-primary rounded-pill fx fx-lift" disabled>Unavailable</button></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 */
/* Modifier classes that add an effect to a standard Bootstrap .btn */
.fx { position: relative; overflow: hidden; isolation: isolate; white-space: nowrap; flex: none; transition: color .3s, transform .25s, box-shadow .3s, background-color .3s, border-color .3s; }
.fx:focus-visible { outline: 3px solid var(--bs-focus-ring-color); outline-offset: 3px; }
/* 1 slide fill (on btn-outline-primary) */
.fx-fill::before { content: ""; position: absolute; inset: 0; z-index: -1; background: var(--bs-primary); transform: translateX(-101%); transition: transform .35s cubic-bezier(.2, .8, .2, 1); }
.fx-fill:focus-visible::before { transform: none; }
.fx-fill:focus-visible { color: #fff; }
/* 2 lift: soft at rest */
.fx-lift { --bs-btn-color: var(--bs-primary-text-emphasis); --bs-btn-bg: var(--bs-primary-bg-subtle); --bs-btn-border-color: var(--bs-primary-border-subtle); --bs-btn-hover-color: #fff; --bs-btn-hover-bg: var(--bs-primary); --bs-btn-hover-border-color: var(--bs-primary); --bs-btn-active-color: #fff; --bs-btn-active-bg: var(--bs-primary); --bs-btn-active-border-color: var(--bs-primary); --bs-btn-disabled-color: var(--bs-primary-text-emphasis); --bs-btn-disabled-bg: var(--bs-primary-bg-subtle); --bs-btn-disabled-border-color: var(--bs-primary-border-subtle); }
.fx-lift:focus-visible { transform: translateY(-4px); box-shadow: 0 12px 24px -8px rgba(var(--bs-primary-rgb), .6); }
/* 3 shine: dark emphasis */
.fx-shine { --bs-btn-color: var(--bs-body-bg); --bs-btn-bg: var(--bs-emphasis-color); --bs-btn-border-color: var(--bs-emphasis-color); --bs-btn-hover-color: var(--bs-body-bg); --bs-btn-hover-bg: var(--bs-emphasis-color); --bs-btn-hover-border-color: var(--bs-emphasis-color); --bs-btn-active-color: var(--bs-body-bg); --bs-btn-active-bg: var(--bs-emphasis-color); --bs-btn-active-border-color: var(--bs-emphasis-color); --bs-btn-disabled-bg: var(--bs-emphasis-color); --bs-btn-disabled-border-color: var(--bs-emphasis-color); --bs-btn-disabled-color: var(--bs-body-bg); }
.fx-shine::after { content: ""; position: absolute; top: 0; bottom: 0; left: -60%; width: 40%; z-index: -1; background: linear-gradient(100deg, transparent, rgba(255, 255, 255, .45), transparent); transform: skewX(-20deg); }
.fx-shine:focus-visible::after { left: 130%; transition: left .7s ease; }
/* 4 arrow (with icon) */
.fx-arrow svg { transition: transform .3s; }
.fx-arrow:focus-visible svg { transform: translateX(5px); }
/* 5 glow ring: neutral surface */
.fx-ring { --bs-btn-color: var(--bs-emphasis-color); --bs-btn-bg: var(--bs-body-bg); --bs-btn-border-color: var(--bs-border-color); --bs-btn-hover-color: var(--bs-emphasis-color); --bs-btn-hover-bg: var(--bs-body-bg); --bs-btn-hover-border-color: var(--bs-primary); --bs-btn-active-color: var(--bs-emphasis-color); --bs-btn-active-bg: var(--bs-body-bg); --bs-btn-active-border-color: var(--bs-primary); --bs-btn-disabled-bg: var(--bs-body-bg); }
.fx-ring:focus-visible, .fx-ring.is-hover { border-color: var(--bs-primary); box-shadow: 0 0 0 4px rgba(var(--bs-primary-rgb), .25), 0 0 0 10px rgba(var(--bs-primary-rgb), .1); }
/* 6 press: 3D key derived from the theme */
.fx-press { --fx-edge: var(--bs-primary-text-emphasis); box-shadow: 0 5px 0 var(--fx-edge); }
.fx-press:focus-visible { transform: translateY(2px); box-shadow: 0 3px 0 var(--fx-edge); }
.fx-press:active { transform: translateY(5px) !important; box-shadow: 0 0 0 var(--fx-edge) !important; }
/* Hover effects only where hover exists, so touch never gets stuck */
@media (hover: hover) {
  .fx-fill:hover { color: #fff; } .fx-fill:hover::before { transform: none; }
  .fx-lift:hover { transform: translateY(-4px); box-shadow: 0 12px 24px -8px rgba(var(--bs-primary-rgb), .6); } .fx-lift:active { transform: translateY(-1px); }
  .fx-shine:hover::after { left: 130%; transition: left .7s ease; }
  .fx-arrow:hover svg { transform: translateX(5px); }
  .fx-ring:hover { box-shadow: 0 0 0 4px rgba(var(--bs-primary-rgb), .25), 0 0 0 10px rgba(var(--bs-primary-rgb), .1); }
  .fx-press:hover { transform: translateY(2px); box-shadow: 0 3px 0 var(--fx-edge); }
}
/* Disabled: no effects */
.fx:disabled, .fx.disabled { transform: none !important; box-shadow: none !important; }
.fx:disabled::before, .fx:disabled::after, .fx.disabled::before, .fx.disabled::after { display: none; }
.wdw-min0 { min-width: 0; }
@media (prefers-reduced-motion: reduce) { .fx, .fx::before, .fx::after, .fx svg { transition: none !important; } }