Moonstone Blue (#73A9C2)

/* Background */
.element {
    background-color: #73A9C2;
}

/* Text */
.element {
    color: #73A9C2;
}

/* Border */
.element {
    border: 1px solid #73A9C2;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #73A9C2,
        #DBB9A9
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #73A9C2,
        #DBB9A9
    );
}

// SCSS variable
$moonstone-blue: #73A9C2;

// With RGB channels (useful for rgba() usage)
$moonstone-blue-r: 115;
$moonstone-blue-g: 169;
$moonstone-blue-b: 194;

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