#spinner {
    box-sizing: border-box;
    margin: 20px;
    display: block;
    width: 50px;
    height: 50px;
}
.loading {
    border: 3px solid rgba(0, 0, 0, .3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    -webkit-animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        -webkit-transform: rotate(360deg);
    }
}

@-webkit-keyframes spin {
    to {
        -webkit-transform: rotate(360deg);
    }
}

.text-error {
    color: #F00000;
    font-weight: bold;
}

.text-success {
    color: #28a745;
    display:block;
}