Old Mauve (#673147)

/* Background */
.element {
    background-color: #673147;
}

/* Text */
.element {
    color: #673147;
}

/* Border */
.element {
    border: 1px solid #673147;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #673147,
        #319D71
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #673147,
        #319D71
    );
}

// SCSS variable
$old-mauve: #673147;

// With RGB channels (useful for rgba() usage)
$old-mauve-r: 103;
$old-mauve-g: 49;
$old-mauve-b: 71;

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