.site-head {
    margin-top: 3rem;
    margin-bottom: 6rem;
}

.site-title {
    padding: 10px 20px;
    text-align: center;
    font-size: 2.5rem;

    @include media-query(lap-and-up) {
        font-size: 3rem;
    }

    @include media-query(desk) {
        font-size: 5rem;
    }
}

.site-head {
    margin-top: 3rem;
    margin-bottom: 6rem;
}

.site-title {
    padding: 10px 20px;
    text-align: center;
    font-size: 2.3rem;

    @include media-query(lap-and-up) {
        font-size: 3rem;
    }

    @include media-query(desk) {
        font-size: 5rem;
    }
}

Adjust font size of site title
Adjust font size of site title
