Amaranth Red (#D3212D)

/* Background */
.element {
    background-color: #D3212D;
}

/* Text */
.element {
    color: #D3212D;
}

/* Border */
.element {
    border: 1px solid #D3212D;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #D3212D,
        #AEF8F3
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #D3212D,
        #AEF8F3
    );
}

// SCSS variable
$amaranth-red: #D3212D;

// With RGB channels (useful for rgba() usage)
$amaranth-red-r: 211;
$amaranth-red-g: 33;
$amaranth-red-b: 45;

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