.loader {
    left: 50%;
    border: 8px solid #F3F3F3;
    border-top: 8px solid #3495DB;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1.5s linear infinite;
}

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