Blue Lagoon (#5E93A1)

/* Background */
.element {
    background-color: #5E93A1;
}

/* Text */
.element {
    color: #5E93A1;
}

/* Border */
.element {
    border: 1px solid #5E93A1;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #5E93A1,
        #C88A7A
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #5E93A1,
        #C88A7A
    );
}

// SCSS variable
$blue-lagoon: #5E93A1;

// With RGB channels (useful for rgba() usage)
$blue-lagoon-r: 94;
$blue-lagoon-g: 147;
$blue-lagoon-b: 161;

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