.wpwf-btn {
    position: fixed;
    bottom: 20px;
    z-index: 9999;
    width: 65px;
    height: 65px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: #25d366;
    box-shadow: 0 4px 12px rgba(0,0,0,0.25);
    transition: transform .2s ease;
}

.wpwf-btn:hover {
    transform: scale(1.08);
}

.wpwf-btn img {
    width: 40px;
    height: auto;
}

.wpwf-right { right: 20px; }
.wpwf-left { left: 20px; }