.my-float-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9999;
    background-image: url('./KakaoTalk_logo.svg.png');
    background-size: cover;
    width: 60px;
    height: 60px;
    display: block;
    text-indent: -9999px;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

/* PC용 */
@media (min-width: 768px) {
    .my-float-button {
        bottom: 40px;
        right: 40px;
    }
}