Fern Green (#4F7942)

/* Background */
.element {
    background-color: #4F7942;
}

/* Text */
.element {
    color: #4F7942;
}

/* Border */
.element {
    border: 1px solid #4F7942;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #4F7942,
        #9642B0
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #4F7942,
        #9642B0
    );
}

// SCSS variable
$fern-green: #4F7942;

// With RGB channels (useful for rgba() usage)
$fern-green-r: 79;
$fern-green-g: 121;
$fern-green-b: 66;

// Usage
.element {
    background-color: $fern-green;
    color: rgba($fern-green-r, $fern-green-g, $fern-green-b, 0.8);
}