Dark Magenta (#8B008B)

/* Background */
.element {
    background-color: #8B008B;
}

/* Text */
.element {
    color: #8B008B;
}

/* Border */
.element {
    border: 1px solid #8B008B;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #8B008B,
        #17FF17
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #8B008B,
        #17FF17
    );
}

// SCSS variable
$dark-magenta: #8B008B;

// With RGB channels (useful for rgba() usage)
$dark-magenta-r: 139;
$dark-magenta-g: 0;
$dark-magenta-b: 139;

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