.btn {
    height: 75px;
    width: 75px;
    background: rgba(255, 255, 255, 0.589);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    position: fixed;
    right: 40px;
    bottom: 40px;
    cursor: pointer;
}

.icone {
    width: 50px;
}

#invisible-h2 {
    visibility: hidden;
}