Persian Blue (#1C39BB)

/* Background */
.element {
    background-color: #1C39BB;
}

/* Text */
.element {
    color: #1C39BB;
}

/* Border */
.element {
    border: 1px solid #1C39BB;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #1C39BB,
        #F5E081
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #1C39BB,
        #F5E081
    );
}

// SCSS variable
$persian-blue: #1C39BB;

// With RGB channels (useful for rgba() usage)
$persian-blue-r: 28;
$persian-blue-g: 57;
$persian-blue-b: 187;

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