body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            margin: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
        }
        .container {
            background-color: #fff;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            width: 100%;
            max-width: 400px;
            text-align: center;
        }
        h1 {
            color: #333;
            margin-bottom: 20px;
        }
        .form-group {
            margin-bottom: 15px;
            text-align: left;
        }
        label {
            display: block;
            margin-bottom: 5px;
            color: #555;
            font-weight: bold;
        }
        select, input[type="text"], input[type="password"], input[type="url"] {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
            box-sizing: border-box;
        }
        button {
            background-color: #007bff;
            color: white;
            padding: 10px 15px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
            width: 100%;
            margin-top: 10px;
        }
        button:hover {
            opacity: 0.9;
        }

        .actions button {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            font-size: 20px;
            padding: 0;
            line-height: 40px;
            text-align: center;
            border: 1px solid transparent;
            background-color: transparent;
        }

        .actions button.set-active-button {
            color: #28a745;
            border-color: #28a745;
        }

        .actions button.delete {
            color: #dc3545;
            border-color: #dc3545;
        }

        .actions button:hover {
            opacity: 0.7;
        }

        .error-message {
            color: #dc3545;
            margin-top: 10px;
        }
        .success-message {
            color: #28a745;
            margin-top: 10px;
        }

        .provider-list li {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 10px;
            padding: 10px;
        }

        .provider-list li.active {
            background-color: #e6ffed; /* light-green */
            border-left: 5px solid #28a745; /* green */
            padding-left: 10px;
            border-radius: 4px;
        }

        button.set-active-button:disabled {
            background-color: #cccccc; /* Grey color */
            cursor: not-allowed;
        }