body{background-color:#171717;color:#fff;font-family:Arial,sans-serif}a{color:#fff}.card{background-color:#333;border:none;margin-top:50px}.card-header{background-color:#444;border-bottom:1px solid #555}.form-control{background-color:#222;color:#fff;border:1px solid #555}.form-control:focus{background-color:#222;color:#fff;border-color:#777}.btn-primary{background-color:#4da6ff;border-color:#3a94d6}.btn-primary:hover{background-color:#3a94d6;border-color:#3290c8}.container{padding-top:20px}.invalid-feedback{color:#f66}@media (max-width: 768px){.card{margin-top:20px}}