Light Gray (#D3D3D3)

/* Background */
.element {
    background-color: #D3D3D3;
}

/* Text */
.element {
    color: #D3D3D3;
}

/* Border */
.element {
    border: 1px solid #D3D3D3;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #D3D3D3,
        #D3D3D3
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #D3D3D3,
        #D3D3D3
    );
}

// SCSS variable
$light-gray: #D3D3D3;

// With RGB channels (useful for rgba() usage)
$light-gray-r: 211;
$light-gray-g: 211;
$light-gray-b: 211;

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