Antique Ruby (#841B2D)

/* Background */
.element {
    background-color: #841B2D;
}

/* Text */
.element {
    color: #841B2D;
}

/* Border */
.element {
    border: 1px solid #841B2D;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #841B2D,
        #22E6C4
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #841B2D,
        #22E6C4
    );
}

// SCSS variable
$antique-ruby: #841B2D;

// With RGB channels (useful for rgba() usage)
$antique-ruby-r: 132;
$antique-ruby-g: 27;
$antique-ruby-b: 45;

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