.loader {  
            position: fixed;  
            left: 50%;  
            top: 50%;  
            transform: translate(-50%, -50%);  
            border: 16px solid #f3f3f3;  
            border-radius: 50%;  
            border-top: 16px solid #3498db;  
            width: 120px;  
            height: 120px;  
            -webkit-animation: spin 2s linear infinite;  
            animation: spin 2s linear infinite;  
            display: none;  
            z-index: 9999; 
        }  
  
        @-webkit-keyframes spin {  
            0% { transform: translate(-50%, -50%) rotate(0deg); }  
            100% { transform: translate(-50%, -50%) rotate(360deg); }  
        }  
  
        @keyframes spin {  
            0% { transform: translate(-50%, -50%) rotate(0deg); }  
            100% { transform: translate(-50%, -50%) rotate(360deg); }  
        }