body {
  margin: 0;
  padding: 0;
  background: linear-gradient(130deg, #0f0f0f, #1a1a1a, #111);
  font-family: 'Segoe UI', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding-top: 70px;
}

.error-box {
  background-color: #a4e5a0;
  border-radius: 20px;
  padding: 40px 60px;
  text-align: center;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  color: #1d421d;
  max-width: 500px;
  margin: 20px;
}

.error-box h1 {
  font-size: 72px;
  margin-bottom: 10px;
}

.error-box h3 {
  font-size: 24px;
  margin-bottom: 20px;
}

.error-box p {
  font-size: 16px;
}

.btn-accueil {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #70d6ff;
  color: white;
  padding: 10px 25px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: bold;
  font-size: 16px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-accueil:hover {
  transform: translateX(-50%) translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}