.footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 60px; /* Set the fixed height of the footer here */
    line-height: 60px; /* Vertically center the text there */
    background-color: blue;
}

#myBtnFlotante /*boton flotante regreso top*/ {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: white;
    color: #5bc0de;
    cursor: pointer;
    padding: 15px;
    border-radius: 4px;
}

    #myBtnFlotante:hover /*boton flotante regreso top accion hover*/ {
        background-color: #555;
        color: white;
    }