Rusty Red (#DA2C43)

/* Background */
.element {
    background-color: #DA2C43;
}

/* Text */
.element {
    color: #DA2C43;
}

/* Border */
.element {
    border: 1px solid #DA2C43;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #DA2C43,
        #BCF8F0
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #DA2C43,
        #BCF8F0
    );
}

// SCSS variable
$rusty-red: #DA2C43;

// With RGB channels (useful for rgba() usage)
$rusty-red-r: 218;
$rusty-red-g: 44;
$rusty-red-b: 67;

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