Blue-magenta Violet (#553592)

/* Background */
.element {
    background-color: #553592;
}

/* Text */
.element {
    color: #553592;
}

/* Border */
.element {
    border: 1px solid #553592;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #553592,
        #A8D74D
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #553592,
        #A8D74D
    );
}

// SCSS variable
$blue-magenta-violet: #553592;

// With RGB channels (useful for rgba() usage)
$blue-magenta-violet-r: 85;
$blue-magenta-violet-g: 53;
$blue-magenta-violet-b: 146;

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