Caput Mortuum (#592720)

/* Background */
.element {
    background-color: #592720;
}

/* Text */
.element {
    color: #592720;
}

/* Border */
.element {
    border: 1px solid #592720;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #592720,
        #208492
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #592720,
        #208492
    );
}

// SCSS variable
$caput-mortuum: #592720;

// With RGB channels (useful for rgba() usage)
$caput-mortuum-r: 89;
$caput-mortuum-g: 39;
$caput-mortuum-b: 32;

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