Ruby Red (#9B111E)

/* Background */
.element {
    background-color: #9B111E;
}

/* Text */
.element {
    color: #9B111E;
}

/* Border */
.element {
    border: 1px solid #9B111E;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #9B111E,
        #42F4E3
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #9B111E,
        #42F4E3
    );
}

// SCSS variable
$ruby-red: #9B111E;

// With RGB channels (useful for rgba() usage)
$ruby-red-r: 155;
$ruby-red-g: 17;
$ruby-red-b: 30;

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