Blue (RYB) (#0247FE)

/* Background */
.element {
    background-color: #0247FE;
}

/* Text */
.element {
    color: #0247FE;
}

/* Border */
.element {
    border: 1px solid #0247FE;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #0247FE,
        #FFFEFD
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #0247FE,
        #FFFEFD
    );
}

// SCSS variable
$blue-(ryb): #0247FE;

// With RGB channels (useful for rgba() usage)
$blue-(ryb)-r: 2;
$blue-(ryb)-g: 71;
$blue-(ryb)-b: 254;

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