Dark Cerulean (#08457E)

/* Background */
.element {
    background-color: #08457E;
}

/* Text */
.element {
    color: #08457E;
}

/* Border */
.element {
    border: 1px solid #08457E;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #08457E,
        #F47A08
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #08457E,
        #F47A08
    );
}

// SCSS variable
$dark-cerulean: #08457E;

// With RGB channels (useful for rgba() usage)
$dark-cerulean-r: 8;
$dark-cerulean-g: 69;
$dark-cerulean-b: 126;

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