body {
  background-image: url('../images/bg.png');
  background-color: powderblue;
  background-size: cover;
  background-position: center;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
.login-container {
  background-color: rgba(255, 255, 255, 0.95);
  padding: 40px;
  border-radius: 20px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
  width: 100%;
  max-width: 400px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.login-container:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.4);
}
.logo {
  background-image: url('../images/nts_logo.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  height: 150px;
  width: 100%;
  margin-bottom: 1px;
}
.spinner-border {
  width: 1rem;
  height: 1rem;
  border-width: 0.15em;
  vertical-align: text-bottom;
  margin-left: 0.5rem;
}