Medium Blue (#0000CD)

/* Background */
.element {
    background-color: #0000CD;
}

/* Text */
.element {
    color: #0000CD;
}

/* Border */
.element {
    border: 1px solid #0000CD;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #0000CD,
        #CDCD00
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #0000CD,
        #CDCD00
    );
}

// SCSS variable
$medium-blue: #0000CD;

// With RGB channels (useful for rgba() usage)
$medium-blue-r: 0;
$medium-blue-g: 0;
$medium-blue-b: 205;

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