body {
    font-size: 16px;
    font-family: "Oswald", sans-serif;
    background-color: #cfedf7;
    margin: 0 auto;
    text-align: center;
}

main {
    display: block;
    align-items: center;
    justify-content: center;
}

picture img[data-src] {
    width: 300px;
    height: 400px;
    filter: blur(0.2em);
    box-shadow: 0 0 2rem #777;
}

picture img {
    margin: 1rem;
    width: 300px;
    height: 400px;
    filter: blur(0em);
    transition: filter 0.5s;
    box-shadow: 0 0 2rem #777;
}