.btn {
    appearance: none;
      -webkit-appearance: none;
    font-family: sans-serif;
    cursor: pointer;
    padding: 12px;
    min-width: 100px;
    border: 0px;
      -webkit-transition: background-color 100ms linear;
      -ms-transition: background-color 100ms linear;
       transition: background-color 100ms linear;
  }
  
  .btn:focus, .btn.focus {
    outline: 0;
  }
  
  .btn-round-1 {
    border-radius: 8px;
  }
  
  .btn-round-2 {
    border-radius: 20px;
  }
  
  .btn-dark {
    background: #000;
    color: #ffffff;
  }
  
  .btn-dark:hover {
    background: #212121;
    color: #ffffff;
  }
  
  .btn-light {
    background: #ededed;
    color: #000;
  }
  
  .btn-light:hover {
    background: #dbdbdb;
    color: #000;
  }
  
  .btn-primary {
    background: #3498db;
    color: #ffffff;

  }
  
  .btn-primary:hover {
    background: #2980b9;
    color: #ffffff;
  }
  
  .btn-success {
    background: #2ecc71;
    color: #ffffff;
  }
  
  .btn-success:hover {
    background: #27ae60;
    color: #ffffff;
  }
  
  .btn-warning {
    background: #f1c40f;
    color: #ffffff;
  }
  
  .btn-warning:hover {
    background: #f39c12;
    color: #ffffff;
  }
  
  .btn-danger {
    background: #e74c3c;
    color: #ffffff;
  }
  
  .btn-danger:hover {
    background: #c0392b;
    color: #ffffff;
  }

  .loader {
    border: 16px solid #f3f3f3; /* Light grey */
    border-top: 16px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 120px;
    height: 120px;
    animation: spin 2s linear infinite;
  }
  
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }