body, html {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.background {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: url('pobrane.jpg') no-repeat center center fixed;
  background-size: cover;
  z-index: -1;
}

.logo-container {
  text-align: center;
  margin-top: 20px;
}

.signup-container {
  max-width: 800px;
  margin: 40px auto;
  background-color: rgba(255, 255, 255, 0.95);
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.1);
}