Lawn Green (#7CFC00)

/* Background */
.element {
    background-color: #7CFC00;
}

/* Text */
.element {
    color: #7CFC00;
}

/* Border */
.element {
    border: 1px solid #7CFC00;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #7CFC00,
        #FCF9FF
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #7CFC00,
        #FCF9FF
    );
}

// SCSS variable
$lawn-green: #7CFC00;

// With RGB channels (useful for rgba() usage)
$lawn-green-r: 124;
$lawn-green-g: 252;
$lawn-green-b: 0;

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