Caribbean Green (#00CC99)

/* Background */
.element {
    background-color: #00CC99;
}

/* Text */
.element {
    color: #00CC99;
}

/* Border */
.element {
    border: 1px solid #00CC99;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #00CC99,
        #CC0033
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #00CC99,
        #CC0033
    );
}

// SCSS variable
$caribbean-green: #00CC99;

// With RGB channels (useful for rgba() usage)
$caribbean-green-r: 0;
$caribbean-green-g: 204;
$caribbean-green-b: 153;

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