.form-submit-spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    margin-right: 0.5rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: form-submit-spin 0.65s linear infinite;
    vertical-align: -0.12em;
}

button.is-submitting,
input[type="submit"].is-submitting,
.btn.is-submitting,
button.is-loading,
input[type="submit"].is-loading,
.btn.is-loading {
    opacity: 0.85;
    cursor: not-allowed;
    pointer-events: none;
}

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