astra_get_css_value( string $value = '', string $unit = 'px', string $default = '' )

	function astra_get_css_value( $value = '', $unit = 'px', $default = '' ) {

		if ( '' == $value && '' == $default ) {
			return $value;
		}

		$css_val = '';

		switch ( $unit ) {

			case 'font':
				if ( 'inherit' != $value ) {
					$value   = astra_get_font_family( $value );
					$css_val = $value;
				} elseif ( '' != $default ) {
					$css_val = $default;
				} else {
					$css_val = '';
				}
				break;

			case 'px':
			case '%':
				if ( 'inherit' === strtolower( $value ) || 'inherit' === strtolower( $default ) ) {
					return $value;
				}

				$value   = ( '' != $value ) ? $value : $default;
				$css_val = esc_attr( $value ) . $unit;
				break;

			case 'url':
						$css_val = $unit . '(' . esc_url( $value ) . ')';
				break;

			case 'rem':
				if ( 'inherit' === strtolower( $value ) || 'inherit' === strtolower( $default ) ) {
					return $value;
				}
				if ( is_numeric( $value ) || strpos( $value, 'px' ) ) {
					$value          = intval( $value );
					$body_font_size = astra_get_option( 'font-size-body' );
					if ( is_array( $body_font_size ) ) {
						$body_font_size_desktop = ( isset( $body_font_size['desktop'] ) && '' != $body_font_size['desktop'] ) ? $body_font_size['desktop'] : 15;
					} else {
						$body_font_size_desktop = ( '' != $body_font_size ) ? $body_font_size : 15;
					}

					if ( $body_font_size_desktop ) {
						$css_val = esc_attr( $value ) . 'px;font-size:' . ( esc_attr( $value ) / esc_attr( $body_font_size_desktop ) ) . $unit;
					}
				} else {
					$css_val = esc_attr( $value );
				}

				break;

			default:
				$value = ( '' != $value ) ? $value : $default;
				if ( '' != $value ) {
					$css_val = esc_attr( $value ) . $unit;
				}
		}

		return $css_val;
	}