Hi,
Yes, or you can add it to your existing code using comma.
eg.
.postid-1 .x-feature-box-content .x-feature-box-text,
.postid-2 .x-feature-box-content .x-feature-box-text,
.postid-3 .x-feature-box-content .x-feature-box-text {
font-family: "Merriweather",serif;
font-size: 228.5%;
line-height: 1.2;
margin-top: 0;
}
Hope that helps.