網頁設計好好玩
Bootstrap4 為行動優先的架構，所以預設的斷點為 (xs)
// Extra small devices (portrait phones, less than 576px) // No media query since this is the default in Bootstrap // Small devices (landscape phones, 576px and up) (sm)(橫的手機) @media (min-width: 576px) { ... } // Medium devices (tablets, 768px and up) (md)(平板) @media (min-width: 768px) { ... } // Large devices (desktops, 992px and up) (lg)(桌機) @media (min-width: 992px) { ... } // Extra large devices (large desktops, 1200px and up) (xl)(較大的桌機) @media (min-width: 1200px) { ... }