.page-loader {
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background-color: #ffffff;
    z-index: 9999;
}

.page-loader .spinner {
    width: 40px;
    height: 40px;
    position: absolute;
    top: 50%;
    left: 50%;
    margin: -20px 0 0 -20px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}