.div-gotop {
    position: fixed;
    bottom: 50px;
    right: 50px;
    z-index: 1000;
    width: 45px;
    height: 45px;

    display: flex;
    align-items: center;
    justify-content: center;   

    background: rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 25px;

    cursor: pointer;
    opacity: 0;
    visibility: hidden; 
    transition: opacity 0.25s ease, visibility 0.5s ease;
}

.div-gotop img {
    height: 40px;
}

@media only screen and (max-width: 800px) {
    .div-gotop {
        height: 40px;
        width: 40px;
        bottom: 25px;
        right: 25px;
    }

    .div-gotop img {
        height: 35px;
    }
}