Midnight Green (#004953)

/* Background */
.element {
    background-color: #004953;
}

/* Text */
.element {
    color: #004953;
}

/* Border */
.element {
    border: 1px solid #004953;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #004953,
        #A61400
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #004953,
        #A61400
    );
}

// SCSS variable
$midnight-green: #004953;

// With RGB channels (useful for rgba() usage)
$midnight-green-r: 0;
$midnight-green-g: 73;
$midnight-green-b: 83;

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