Pastel Green (#77DD77)

/* Background */
.element {
    background-color: #77DD77;
}

/* Text */
.element {
    color: #77DD77;
}

/* Border */
.element {
    border: 1px solid #77DD77;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #77DD77,
        #EDCDED
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #77DD77,
        #EDCDED
    );
}

// SCSS variable
$pastel-green: #77DD77;

// With RGB channels (useful for rgba() usage)
$pastel-green-r: 119;
$pastel-green-g: 221;
$pastel-green-b: 119;

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