*{
box-sizing: border-box;
}

body{
    margin:0;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}
h1{
    text-align: center;
}

.row{
    display:flex;
    flex-wrap: wrap;
    padding: 0px;
}

.column{
    flex: 25%;
    max-width: 25%;
    padding: 0px 4px;
}

.column img{
    margin-top: 8px;
    vertical-align: middle;
    width: 100%;
    transition: 0.4s;

}

.column img:hover{
    box-shadow:4px 4px 5px rgba(0,0,0,0.8); 
}

@media screen and (max-width: 800px) {
    .column{
        flex: 50%;
        max-width: 50%;
    }
}

@media screen and (max-width: 600px) {
    .column {
        flex: 100%;
        max-width: 100%;
    }
}