Dark Pastel Red (#C23B22)

/* Background */
.element {
    background-color: #C23B22;
}

/* Text */
.element {
    color: #C23B22;
}

/* Border */
.element {
    border: 1px solid #C23B22;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #C23B22,
        #22A9C2
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #C23B22,
        #22A9C2
    );
}

// SCSS variable
$dark-pastel-red: #C23B22;

// With RGB channels (useful for rgba() usage)
$dark-pastel-red-r: 194;
$dark-pastel-red-g: 59;
$dark-pastel-red-b: 34;

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