.post-series {
    min-height: 20px;
    width: 70%;
    padding: 10px;
    background-color: whitesmoke;
    border: 1px solid gray;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    box-shadow: inset 0 1px 1px rgba(0,0,0,.05);
    box-sizing: border-box;
    margin: 0 auto;
}

.post-series span {
    padding-left: 10px;
    font-size: medium;
    display: flex;
}

.post-series ul {
    list-style-type: none;
}

.post-series ul li {
    font-size: medium;
}