Lemon Yellow (#FFF44F)

/* Background */
.element {
    background-color: #FFF44F;
}

/* Text */
.element {
    color: #FFF44F;
}

/* Border */
.element {
    border: 1px solid #FFF44F;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #FFF44F,
        #4F5AFF
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #FFF44F,
        #4F5AFF
    );
}

// SCSS variable
$lemon-yellow: #FFF44F;

// With RGB channels (useful for rgba() usage)
$lemon-yellow-r: 255;
$lemon-yellow-g: 244;
$lemon-yellow-b: 79;

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