Template:Feed/styles.css

.feed-season, .feed-date {
    border-radius: 0.3em;
    min-width: 1.2500em;
    padding: 0 0.2em;
    height: 1.375em;
    font-weight: 700;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
    text-align: center;
    display: inline-flex;
}

.feed-season {
    color: #000;
    background-color: #fff;
}

body.skin-medik-light .feed-season {
    color: #fff;
    background-color: #000;
}