body{
    
}

.container-boton{

    position: fixed;
    z-index: 999;
    border-radius: 15%;
    bottom: 10px;
    left: 2px;
    padding: 2px;
    transition: ease 0.3s;
    animation: efecto 1.2s infinite;
}

.container-boton:hover{
    transform: scale(1.1);
    transition: 0.3s;
}

.boton{
    width: 80px;
    transition: ease 1s;
}

@keyframes efecto{
    0%{
        box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.85);
    }
    100%{
        box-shadow: 0 0 0 25px rgba(0, 0, 0, 0);
    }
}