True Blue (#0073CF)

/* Background */
.element {
    background-color: #0073CF;
}

/* Text */
.element {
    color: #0073CF;
}

/* Border */
.element {
    border: 1px solid #0073CF;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #0073CF,
        #FFCA9F
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #0073CF,
        #FFCA9F
    );
}

// SCSS variable
$true-blue: #0073CF;

// With RGB channels (useful for rgba() usage)
$true-blue-r: 0;
$true-blue-g: 115;
$true-blue-b: 207;

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