.loader {
    border: 5px solid #f3f3f3;
    border-radius: 50%;
    border-top: 5px solid #c12837;
    width: 50px;
    height: 50px;
    text-align: center;
    -webkit-animation: spin 2s linear infinite; /* Safari */
    animation: spin 2s linear infinite;
}

/* Safari */
@-webkit-keyframes spin {
    0% { -webkit-transform: rotate(0deg); }
    100% { -webkit-transform: rotate(360deg); }
}

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