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.loader {
width: 40px;
height: 40px;
border-radius: 50%;
border: 4px solid #f3f3f3;
border-top: 4px solid #3498db;
animation: spin 1s infinite linear;
}
@keyframes spin {
from {
transform: rotate(0deg);
}
to {
transform: rotate(360deg);
}
}