Space Cadet (#1D2951)

/* Background */
.element {
    background-color: #1D2951;
}

/* Text */
.element {
    color: #1D2951;
}

/* Border */
.element {
    border: 1px solid #1D2951;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #1D2951,
        #856D1D
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #1D2951,
        #856D1D
    );
}

// SCSS variable
$space-cadet: #1D2951;

// With RGB channels (useful for rgba() usage)
$space-cadet-r: 29;
$space-cadet-g: 41;
$space-cadet-b: 81;

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