Old Burgundy (#43302E)

/* Background */
.element {
    background-color: #43302E;
}

/* Text */
.element {
    color: #43302E;
}

/* Border */
.element {
    border: 1px solid #43302E;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #43302E,
        #2E5458
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #43302E,
        #2E5458
    );
}

// SCSS variable
$old-burgundy: #43302E;

// With RGB channels (useful for rgba() usage)
$old-burgundy-r: 67;
$old-burgundy-g: 48;
$old-burgundy-b: 46;

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