body {
    background-color: #f7fafc;
  }
  
  .card {
    border-radius: 2px;
    margin-top: 50px;
  }
  
  .card-header {
    background-color: #343a40;
    color: #fff;
  }
  
  .card-body {
    padding: 30px;
  }
  
  .form-control {
    border-radius: 2px;
  }
  
  .btn-primary {
    background-color: #343a40;
    border-color:#343a40;
    border-radius: 2px;
  }
  
  a {
    color: #343a40;
  }
  .card-header {
    display: flex;                     /* Habilitamos Flexbox */
    justify-content: center;           /* Centramos horizontalmente */
    align-items: center;               /* Centramos verticalmente (opcional) */
  } 

 .btn-primary:hover{
    background-color: #222931;
    border-color:#222931;
 }