Imperial Blue (#002395)

/* Background */
.element {
    background-color: #002395;
}

/* Text */
.element {
    color: #002395;
}

/* Border */
.element {
    border: 1px solid #002395;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #002395,
        #FFCD2B
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #002395,
        #FFCD2B
    );
}

// SCSS variable
$imperial-blue: #002395;

// With RGB channels (useful for rgba() usage)
$imperial-blue-r: 0;
$imperial-blue-g: 35;
$imperial-blue-b: 149;

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