#wrap_estate {
    width:100%;
    height:auto;
    display:flex;
    flex-wrap:wrap;
    justify-content:space-evenly;
}

#item_mainphoto img{
    height: auto;
    width: 600px;
    max-width: 100%;
    margin: 0 auto;
}

#item_thumb ul{
    list-style: none;
}

#item_thumb li{
    width: 120px;
    float: left;
    margin-right: 5px;
}