.btn-flutuante{
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    position: fixed;
    right: 40px;
    bottom: 40px;    
}

.btn-flutuante #back{
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0px 4px 6px rgba(0,0,0,0.1);
    flex-direction: column;
    background-color: #ff5e00;
    border-radius: 50%;
}

.btn-flutuante p{
    color: #fff;
    font-size: 16px;
    margin-top: 5px;
    font-family: inherit;
    text-align: center;
    font-weight: bold;
}

.btn-flutuante a i{
    font-size: 30px;
    color: #fff;
    text-decoration: none;
    border-radius: 50%;
    padding: 10px 15px;
}

@media (max-width: 620px) {
    .btn-flutuante {
        right: 20px;
        bottom: 20px;
    }

    .btn-flutuante #back {
        width: 50px;
        height: 50px;
    }

    .btn-flutuante p {
        font-size: 14px;
    }

    .btn-flutuante a i {
        font-size: 24px;
    }
}