.spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    vertical-align: top;
    border: .25em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    -webkit-animation: spinner .75s linear infinite;
    animation: spinner .75s linear infinite;
}

@keyframes spinner {
    to {
        transform: rotate(360deg);
    }
}

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