body.dark-mode {
            background-color: #1a1a2e;
        }
        body.dark-mode .login-box {
            background-color: #16213e;
            border-radius: 10px;
            padding: 20px;
        }
        body.dark-mode .card {
            background-color: #16213e;
            border-color: #0f3460;
        }
        body.dark-mode .card-header {
            background-color: #0f3460;
            color: #e0e0e0;
        }
        body.dark-mode .card-body {
            color: #e0e0e0;
        }
        body.dark-mode .form-control {
            background-color: #1a1a2e;
            border-color: #0f3460;
            color: #e0e0e0;
        }
        body.dark-mode .form-group label {
            color: #e0e0e0;
        }
        body.dark-mode h1, 
        body.dark-mode h2, 
        body.dark-mode h3,
        body.dark-mode .login-box-msg {
            color: #e0e0e0;
        }