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CSS의 폭과 높이 단위, vw / vh / vmin / vmax

viewport : 브라우저 윈도 창의 크기, 가변적 ※ CSS Viewport is defined as the visible area on a window screen which refers to the displays of the mobile devices. Adding CSS tag with viewport is an efficient way to improve the web pages to look on smaller screens. The ViewPort is not the same size as the original Webpage. It is not a standard but still tagged as a key approach for Responsive Web Design. In sim..