Carmine Red (#FF0038)

/* Background */
.element {
    background-color: #FF0038;
}

/* Text */
.element {
    color: #FF0038;
}

/* Border */
.element {
    border: 1px solid #FF0038;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #FF0038,
        #00FFC7
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #FF0038,
        #00FFC7
    );
}

// SCSS variable
$carmine-red: #FF0038;

// With RGB channels (useful for rgba() usage)
$carmine-red-r: 255;
$carmine-red-g: 0;
$carmine-red-b: 56;

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