Dark Imperial Blue (#00416A)

/* Background */
.element {
    background-color: #00416A;
}

/* Text */
.element {
    color: #00416A;
}

/* Border */
.element {
    border: 1px solid #00416A;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #00416A,
        #D45200
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #00416A,
        #D45200
    );
}

// SCSS variable
$dark-imperial-blue: #00416A;

// With RGB channels (useful for rgba() usage)
$dark-imperial-blue-r: 0;
$dark-imperial-blue-g: 65;
$dark-imperial-blue-b: 106;

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