Royal Purple (#7851A9)

/* Background */
.element {
    background-color: #7851A9;
}

/* Text */
.element {
    color: #7851A9;
}

/* Border */
.element {
    border: 1px solid #7851A9;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #7851A9,
        #AED67C
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #7851A9,
        #AED67C
    );
}

// SCSS variable
$royal-purple: #7851A9;

// With RGB channels (useful for rgba() usage)
$royal-purple-r: 120;
$royal-purple-g: 81;
$royal-purple-b: 169;

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