.post-content-preview h1,
.post-content-preview h2,
.post-content-preview h3,
.post-content-preview h4,
.post-content-preview h5,
.post-content-preview h6 {
    font-size: 1em;
    line-height: inherit;
    font-weight: 600;
    margin: 0 0 0.35em;
}

.post-content-preview > :first-child {
    margin-top: 0;
}