Queen Blue (#436B95)

/* Background */
.element {
    background-color: #436B95;
}

/* Text */
.element {
    color: #436B95;
}

/* Border */
.element {
    border: 1px solid #436B95;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #436B95,
        #CF965B
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #436B95,
        #CF965B
    );
}

// SCSS variable
$queen-blue: #436B95;

// With RGB channels (useful for rgba() usage)
$queen-blue-r: 67;
$queen-blue-g: 107;
$queen-blue-b: 149;

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