Green Blue (#1164B4)

/* Background */
.element {
    background-color: #1164B4;
}

/* Text */
.element {
    color: #1164B4;
}

/* Border */
.element {
    border: 1px solid #1164B4;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #1164B4,
        #F8B370
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #1164B4,
        #F8B370
    );
}

// SCSS variable
$green-blue: #1164B4;

// With RGB channels (useful for rgba() usage)
$green-blue-r: 17;
$green-blue-g: 100;
$green-blue-b: 180;

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