.spinner-border {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    vertical-align: -0.125em;
    border: 0.25em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner-border .75s linear infinite;
}

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