#btnPreloader {
    border: 4px solid transparent;
    border-radius: 50%;
    border-top: 4px solid #ddd;
    border-right: 4px solid #ddd;
    border-bottom: 4px solid #ddd;
    width: 22px;
    height: 22px;
    -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); }
}

#preloader {
    position: relative;
    background-color: #FFF;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    height: auto;
    width: 100%;
}