#gallery{
    width: 300px;
    margin: 20px auto;
    text-align: center;
    /*display: flex;*/
}

#gallery02{
    width: 300px;
    margin: 20px auto;
    text-align: center;
    display: flex;
}

.photo02{
   display: flex;
}

#gallery .photos img{
    width: 80%;
    display: none;
}

#gallery .photos img:first-child{
    display: block;
}

.buttons {
    margin-top: 20px;
}