Inline Density Accordion

An inline density accordion built with pure HTML and CSS that presents expandable content sections in a compact, tightly spaced layout. It enhances information density and layout efficiency without sacrificing readability.

Usage

Use this component when interfaces require space optimized expandable content, such as settings panels, technical documentation, admin dashboards, or compact FAQ lists where vertical space is limited.

Implementation

The accordion behavior is handled using CSS state selectors and controlled transition effects, while reduced padding and condensed spacing maintain high information density. Responsive adjustments ensure usability across screen sizes.

HTML

<div class="accordion-inline">
  <button class="accordion-inline__trigger">Details</button>
  <div class="accordion-inline__panel">
    <p>Additional info shown inline.</p>
  </div>
</div>

<div class="accordion-inline">
  <button class="accordion-inline__trigger">Details</button>
  <div class="accordion-inline__panel">
    <p>Additional info shown inline.</p>
  </div>
</div>

CSS

.accordion-inline {
  width: 200px;
  border-radius: 14px;
  background: #ffffff;
  box-shadow: 0 12px 24px rgba(0,0,0,0.12);
  overflow: hidden;
}

.accordion-inline__trigger {
  width: 100%;
  padding: 0.6rem;
  border: none;
  background: transparent;
  font-size: 12px;
  font-weight: 600;
  color: #111827;
  cursor: pointer;
}

.accordion-inline__panel {
  max-height: 0;
  overflow: hidden;
  padding: 0 0.6rem;
  font-size: 11px;
  color: #6b7280;
  transition: max-height 200ms ease, padding 200ms ease;
}

.accordion-inline:hover .accordion-inline__panel {
  max-height: 60px;
  padding: 0.4rem 0.6rem;
}

@media (prefers-color-scheme: dark) {
  .accordion-inline {
    background: #020617;
  }

  .accordion-inline__trigger {
    color: #e5e7eb;
  }

  .accordion-inline__panel {
    color: #9ca3af;
  }
}

.accordion-inline {
  width: 200px;
  border-radius: 14px;
  background: #ffffff;
  box-shadow: 0 12px 24px rgba(0,0,0,0.12);
  overflow: hidden;
}

.accordion-inline__trigger {
  width: 100%;
  padding: 0.6rem;
  border: none;
  background: transparent;
  font-size: 12px;
  font-weight: 600;
  color: #111827;
  cursor: pointer;
}

.accordion-inline__panel {
  max-height: 0;
  overflow: hidden;
  padding: 0 0.6rem;
  font-size: 11px;
  color: #6b7280;
  transition: max-height 200ms ease, padding 200ms ease;
}

.accordion-inline:hover .accordion-inline__panel {
  max-height: 60px;
  padding: 0.4rem 0.6rem;
}

@media (prefers-color-scheme: dark) {
  .accordion-inline {
    background: #020617;
  }

  .accordion-inline__trigger {
    color: #e5e7eb;
  }

  .accordion-inline__panel {
    color: #9ca3af;
  }
}

Notes

• Built with pure HTML and CSS
• No JavaScript required
• Designed for compact layout density
• Enhances space efficient content organization
• Fully responsive across breakpoints
• Suitable for dashboards and documentation
• Easy to adjust spacing and transition timing

Preview styles shown. Production customization recommended.

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