.post-box__img {
    position: absolute;
    object-fit: cover;

    width: 18vw;
    height: 18vw;
    border-radius: 50%;
    margin-top: 3vw;
    border: solid 0.3vw #BBBBBB;
}

@media screen and (max-width: 1000px) and (orientation: portrait) {
    .post-box__img {
        width: 30vw;
        height: 30vw;
        margin: 5vw;
    }
}