#loader {
    position: fixed;
    left: 50%;
    top: 50%;
    z-index: 9999;
    margin: -75px 0 0 -75px;
    border: 1rem solid #ffffff;
    border-radius: 50%;
    border-top: 1rem solid #3498db;
    width: 8rem;
    height: 8rem;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
}

#carregando {
    background: #000000;
    opacity: 0.3;
    content: '';
    margin: auto;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    z-index: 999;
}

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

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