Dark Jungle Green (#1A2421)

/* Background */
.element {
    background-color: #1A2421;
}

/* Text */
.element {
    color: #1A2421;
}

/* Border */
.element {
    border: 1px solid #1A2421;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #1A2421,
        #2E1A20
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #1A2421,
        #2E1A20
    );
}

// SCSS variable
$dark-jungle-green: #1A2421;

// With RGB channels (useful for rgba() usage)
$dark-jungle-green-r: 26;
$dark-jungle-green-g: 36;
$dark-jungle-green-b: 33;

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