style3.css

@media only screen and (max-width: 600px) {
    .photo-wrapper{
        flex-basis: 95%;
        padding: 1%;
        margin: 10px;
    }
} 
@media only screen and (min-width: 600px) {
    .photo-wrapper{
        flex-basis: 46%;
        padding: 1%;
        margin: 5px;
    }
} 

@media only screen and (min-width: 1100px) {
    .photo-wrapper{
        flex-basis: 21%;
        padding: 1%;
    }
} 

.footer{
    text-align: center;
    padding: 20px;
    background-color: #FCD22Aea;
    color: white;
}
.gallery-wrapper{
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly;
    margin: 10px;
}
.photo-wrapper{
    
    border: 1px solid lightgray;
    border-radius: 10px;
    text-align: center;            
}
.photo-wrapper > img{
    width: 90%;
} 
.gallery-wrapper .heading{
    margin: 10px;
}