Let's read a common 'elevated card' style rule by rule.
.card { border: 2px solid #1E2A5A; border-radius: 12px; box-shadow: 0 4px 12px rgba(0,0,0,0.15); padding: 20px; }.
border: 2px solid #1E2A5A packs three things into one line: a 2-pixel width, a solid line style (as opposed to dashed or dotted), and a navy color all three are required together, or no border shows at all.
border-radius: 12px then softens every corner of that border by 12 pixels, turning the sharp rectangle into a card with gently rounded edges a small value like this reads as 'friendly and modern' rather than a harsh box.
box-shadow: 0 4px 12px rgba(0,0,0,0.15) adds the illusion of the card floating slightly above the page. Reading left to right: 0 means no horizontal shift, 4px pushes the shadow slightly downward, 12px blurs it into a soft gradient rather than a hard edge, and rgba(0,0,0,0.15) is black at only 15% opacity faint enough to feel like a subtle shadow, not a heavy black smudge.
padding: 20px, as always, keeps the card's text from touching its own rounded, shadowed border directly.
Together, these four properties are the exact recipe behind most 'card' components you see across modern websites and apps.