.loading {
    display: inline-block;
    height: 64px;
    text-align: center;
    margin: 0 auto;
    margin-top: 0.5em;
    display: table;
}

.loading:after {
    content: " ";
    display: block;
    left: auto;
    right: auto;
    width: 46px;
    height: 46px;
    margin: 1px;
    border-radius: 50%;
    border: 5px solid #000;
    border-color: #000 transparent #000 transparent;
    animation: loading 1.2s linear infinite;
}

@keyframes loading {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}