Kelly Green (#4CBB17)

/* Background */
.element {
    background-color: #4CBB17;
}

/* Text */
.element {
    color: #4CBB17;
}

/* Border */
.element {
    border: 1px solid #4CBB17;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #4CBB17,
        #D07FF7
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #4CBB17,
        #D07FF7
    );
}

// SCSS variable
$kelly-green: #4CBB17;

// With RGB channels (useful for rgba() usage)
$kelly-green-r: 76;
$kelly-green-g: 187;
$kelly-green-b: 23;

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