.wfb-container {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
}

.wfb-button {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 60px;
    background: #25D366;
    border-radius: 50%;
    text-align: center;
    color: #fff;
    font-size: 30px;
    line-height: 60px;
    box-shadow: 0 0 15px rgba(0,0,0,0.3);
    overflow: visible;
    transition: transform 0.3s;
}

.wfb-button:hover {
    transform: scale(1.1);
}

.wfb-wave, .wfb-wave2 {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: rgba(37, 211, 102, 0.4);
    top: 0;
    left: 0;
    animation: wave 2s infinite;
    z-index: -1;
}

.wfb-wave2 {
    animation-delay: 1s;
}

@keyframes wave {
    0% {
        transform: scale(1);
        opacity: 0.7;
    }
    50% {
        transform: scale(1.5);
        opacity: 0.3;
    }
    100% {
        transform: scale(2);
        opacity: 0;
    }
}