Vivid Cerulean (#00AAEE)

/* Background */
.element {
    background-color: #00AAEE;
}

/* Text */
.element {
    color: #00AAEE;
}

/* Border */
.element {
    border: 1px solid #00AAEE;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #00AAEE,
        #FFE7DD
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #00AAEE,
        #FFE7DD
    );
}

// SCSS variable
$vivid-cerulean: #00AAEE;

// With RGB channels (useful for rgba() usage)
$vivid-cerulean-r: 0;
$vivid-cerulean-g: 170;
$vivid-cerulean-b: 238;

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