Green Yellow (#ADFF2F)

/* Background */
.element {
    background-color: #ADFF2F;
}

/* Text */
.element {
    color: #ADFF2F;
}

/* Border */
.element {
    border: 1px solid #ADFF2F;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #ADFF2F,
        #812FFF
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #ADFF2F,
        #812FFF
    );
}

// SCSS variable
$green-yellow: #ADFF2F;

// With RGB channels (useful for rgba() usage)
$green-yellow-r: 173;
$green-yellow-g: 255;
$green-yellow-b: 47;

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