简约风绿色盾牌银色边框十字架保护安全插画

minimalist icon design, green and silver color scheme, shield-shaped icon with a plus sign in the center, shield positioned at the center of the image, plus sign centered within the shield, clean and simple atmosphere, symbolic of protection and healthcare, silver border, green gradient inside the shield, light green plus sign, pure white background, clear and intuitive visual design, conveys protection and health