/* Spinner shown on submit buttons while a form is being processed. */
button.is-loading,
input[type="submit"].is-loading {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6em;
    cursor: wait;
}

button.is-loading::before,
input[type="submit"].is-loading::before {
    content: "";
    flex: none;
    width: 1em;
    height: 1em;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-top-color: currentColor;
    border-radius: 50%;
    animation: form-loading-spin 0.7s linear infinite;
}

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