.post-item-excerpt.excerpt-size-small {
    font-size: 14px !important;
}
@media only screen and (max-width: 567px)
body, .font-body {
    font-size: 14px !important;
}
@media only screen and (max-width: 600px)
.post-item-title.size-normal {
    font-size: 16px !important;
}