.loader-container {
    width: 100%;
    height: 100%;
    display: flex;
    position: fixed;
}

.loader {
    border: 7px solid #f3f3f3;
    border-top: 7px solid #3498db;
    border-bottom: 7px solid #3498db;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 2s linear infinite;
    margin: auto;
}

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