CSS box-shadow vs filter: drop-shadow() | Example For Beginners - YouTube
CSS3 rounded responsive drop shadows & glows - Web design company Romania
George Moller auf Twitter: „🔥 CSS cheat sheet on box-shadow property. 🧵 Small thread 👇 https://t.co/G4AZtSbHU3“ / Twitter
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Twitter 上的 Andreus:"Mini #CSSTip del día: Cuando hagan box-shadows, pueden lograr sombras más naturales utilizando RGBA con poca opacidad (para que lo oscuro se funda con el color del fondo), valores negativos