Red (Munsell) (#F2003C)

/* Background */
.element {
    background-color: #F2003C;
}

/* Text */
.element {
    color: #F2003C;
}

/* Border */
.element {
    border: 1px solid #F2003C;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #F2003C,
        #E5FFF9
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #F2003C,
        #E5FFF9
    );
}

// SCSS variable
$red-(munsell): #F2003C;

// With RGB channels (useful for rgba() usage)
$red-(munsell)-r: 242;
$red-(munsell)-g: 0;
$red-(munsell)-b: 60;

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