CSS text-box Property - Playground Example

<!DOCTYPE html><html><head><style type="text/css">:root {
  --accent: #4f46e5;
  --bg: #ffffff;
  --muted: #9ca3af;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
  padding: 2rem;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
}

.form {
  width: 360px;
  background: var(--bg);
  padding: 1.25rem;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(16, 24, 40, 0.08);
}

.form label {
  display: block;
  margin: 0 0 0.5rem 0;
  color: #374151;
  font-weight: 600;
}

.text-box {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid #e6e9ee;
  border-radius: 8px;
  background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6);
  transition: box-shadow 180ms ease, border-color 180ms ease, transform 60ms ease;
  outline: none;
  font-size: 1rem;
  color: #111827;
  resize: vertical;
  box-sizing: border-box;
}

.text-box::placeholder {
  color: var(--muted);
  font-weight: 500;
}

.text-box:focus {
  border-color: var(--accent);
  box-shadow: 0 4px 18px rgba(79, 70, 229, 0.12), 0 0 0 4px rgba(79, 70, 229, 0.06);
  transform: translateY(-1px);
}

.text-box--invalid {
  border-color: #ef4444;
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.06);
}

.form-row {
  margin-bottom: 1rem;
}

.small {
  font-size: 0.875rem;
  color: var(--muted);
  margin-top: 0.35rem;
}</style></head><body><div class="form">
  <div class="form-row">
    <label for="name">Name</label>
    <input id="name" class="text-box" type="text" placeholder="Enter your name" />
  </div>

  <div class="form-row">
    <label for="message">Message</label>
    <textarea id="message" class="text-box" rows="4" placeholder="Write a message">
Tip: press Enter for a new line
Email (invalid state example)