Medium Teal Blue (#0054B4)

/* Background */
.element {
    background-color: #0054B4;
}

/* Text */
.element {
    color: #0054B4;
}

/* Border */
.element {
    border: 1px solid #0054B4;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #0054B4,
        #FFB969
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #0054B4,
        #FFB969
    );
}

// SCSS variable
$medium-teal-blue: #0054B4;

// With RGB channels (useful for rgba() usage)
$medium-teal-blue-r: 0;
$medium-teal-blue-g: 84;
$medium-teal-blue-b: 180;

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