Dark Violet (#9400D3)

/* Background */
.element {
    background-color: #9400D3;
}

/* Text */
.element {
    color: #9400D3;
}

/* Border */
.element {
    border: 1px solid #9400D3;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #9400D3,
        #C1FFA7
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #9400D3,
        #C1FFA7
    );
}

// SCSS variable
$dark-violet: #9400D3;

// With RGB channels (useful for rgba() usage)
$dark-violet-r: 148;
$dark-violet-g: 0;
$dark-violet-b: 211;

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