Army Green (#4B5320)

/* Background */
.element {
    background-color: #4B5320;
}

/* Text */
.element {
    color: #4B5320;
}

/* Border */
.element {
    border: 1px solid #4B5320;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #4B5320,
        #302086
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #4B5320,
        #302086
    );
}

// SCSS variable
$army-green: #4B5320;

// With RGB channels (useful for rgba() usage)
$army-green-r: 75;
$army-green-g: 83;
$army-green-b: 32;

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