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| 1 | +<!doctype html> |
| 2 | +<html lang="en"> |
| 3 | +<head> |
| 4 | +<meta charset="utf-8" /> |
| 5 | +<meta name="viewport" content="width=device-width,initial-scale=1" /> |
| 6 | +<title>3D Triangle (CSS only)</title> |
| 7 | +<style> |
| 8 | + :root{ |
| 9 | + --size: 260px; /* width of triangle */ |
| 10 | + --depth: 48px; /* extrusion depth */ |
| 11 | + --bg: #071029; |
| 12 | + --face: #06b6d4; |
| 13 | + --face-2: #038aa6; |
| 14 | + --shadow: rgba(2,6,23,0.6); |
| 15 | + } |
| 16 | + |
| 17 | + html,body{ |
| 18 | + height:100%; |
| 19 | + margin:0; |
| 20 | + font-family: system-ui, Arial; |
| 21 | + background: linear-gradient(180deg, #03243a 0%, var(--bg) 100%); |
| 22 | + display:grid; |
| 23 | + place-items:center; |
| 24 | + color:#fff; |
| 25 | + } |
| 26 | + |
| 27 | + .stage{ |
| 28 | + perspective: 900px; |
| 29 | + } |
| 30 | + |
| 31 | + /* container that preserves 3D children */ |
| 32 | + .prism { |
| 33 | + width: var(--size); |
| 34 | + height: calc(var(--size) * 0.86); /* approx triangle height */ |
| 35 | + position: relative; |
| 36 | + transform-style: preserve-3d; |
| 37 | + transform: rotateX(16deg) rotateY(-16deg); |
| 38 | + transition: transform .45s cubic-bezier(.2,.9,.2,1); |
| 39 | + filter: drop-shadow(0 18px 30px var(--shadow)); |
| 40 | + } |
| 41 | + |
| 42 | + .stage:hover .prism{ |
| 43 | + transform: rotateX(6deg) rotateY(18deg) translateZ(8px); |
| 44 | + } |
| 45 | + |
| 46 | + /* front & back triangular faces */ |
| 47 | + .face { |
| 48 | + position: absolute; |
| 49 | + inset: 0; |
| 50 | + width: 100%; |
| 51 | + height: 100%; |
| 52 | + -webkit-clip-path: polygon(50% 0%, 0% 100%, 100% 100%); |
| 53 | + clip-path: polygon(50% 0%, 0% 100%, 100% 100%); |
| 54 | + backface-visibility: hidden; |
| 55 | + } |
| 56 | + |
| 57 | + .face.front { |
| 58 | + background: linear-gradient(180deg, var(--face) 0%, var(--face-2) 100%); |
| 59 | + transform: translateZ(calc(var(--depth) / 2)); |
| 60 | + box-shadow: 0 6px 18px rgba(3,12,30,.45) inset; |
| 61 | + } |
| 62 | + |
| 63 | + .face.back { |
| 64 | + background: linear-gradient(180deg, var(--face-2) 0%, var(--face) 100%); |
| 65 | + transform: rotateY(180deg) translateZ(calc(var(--depth) / 2)); |
| 66 | + opacity: 0.96; |
| 67 | + } |
| 68 | + |
| 69 | + /* side panels: three trapezoids connecting front & back */ |
| 70 | + .side { |
| 71 | + position: absolute; |
| 72 | + width: 100%; |
| 73 | + height: 100%; |
| 74 | + transform-origin: center; |
| 75 | + backface-visibility: hidden; |
| 76 | + } |
| 77 | + |
| 78 | + /* left side panel */ |
| 79 | + .side.left { |
| 80 | + /* create a quadrilateral covering left edge */ |
| 81 | + -webkit-clip-path: polygon(50% 0%, 0% 100%, 0% 100%, 50% 0%); |
| 82 | + clip-path: polygon(50% 0%, 0% 100%, 0% 100%, 50% 0%); |
| 83 | + background: linear-gradient(90deg, rgba(0,0,0,.12), rgba(0,0,0,0)); |
| 84 | + transform: rotateY(90deg) translateX(calc(var(--size) / -2)) translateZ(calc(var(--depth) / -2)); |
| 85 | + opacity: 0.95; |
| 86 | + } |
| 87 | + |
| 88 | + /* right side panel */ |
| 89 | + .side.right { |
| 90 | + -webkit-clip-path: polygon(50% 0%, 100% 100%, 100% 100%, 50% 0%); |
| 91 | + clip-path: polygon(50% 0%, 100% 100%, 100% 100%, 50% 0%); |
| 92 | + background: linear-gradient(90deg, rgba(0,0,0,0), rgba(0,0,0,.12)); |
| 93 | + transform: rotateY(-90deg) translateX(calc(var(--size) / 2)) translateZ(calc(var(--depth) / -2)); |
| 94 | + opacity: 0.95; |
| 95 | + } |
| 96 | + |
| 97 | + /* bottom side panel (base thickness) */ |
| 98 | + .side.bottom { |
| 99 | + /* a thin band along base */ |
| 100 | + -webkit-clip-path: polygon(0% 100%, 50% 100%, 100% 100%, 100% 100%); |
| 101 | + clip-path: polygon(0% 100%, 50% 100%, 100% 100%, 100% 100%); |
| 102 | + background: linear-gradient(180deg, rgba(0,0,0,.12), rgba(255,255,255,0.02)); |
| 103 | + transform: rotateX(90deg) translateY(calc(var(--size) * 0.43)) translateZ(calc(var(--depth) / -2)); |
| 104 | + height: calc(var(--depth)); |
| 105 | + top: auto; |
| 106 | + bottom: -1px; |
| 107 | + } |
| 108 | + |
| 109 | + /* simple label */ |
| 110 | + .label { |
| 111 | + margin-top: 18px; |
| 112 | + text-align: center; |
| 113 | + font-size: 14px; |
| 114 | + opacity: .85; |
| 115 | + } |
| 116 | + |
| 117 | + /* small responsive tweak */ |
| 118 | + @media (max-width:520px){ |
| 119 | + :root{ --size: 200px; --depth: 36px; } |
| 120 | + } |
| 121 | +</style> |
| 122 | +</head> |
| 123 | +<body> |
| 124 | + <div class="stage"> |
| 125 | + <div class="prism" aria-hidden="true"> |
| 126 | + <div class="face front"></div> |
| 127 | + <div class="face back"></div> |
| 128 | + |
| 129 | + <!-- side panels: visual depth only --> |
| 130 | + <div class="side left"></div> |
| 131 | + <div class="side right"></div> |
| 132 | + <div class="side bottom"></div> |
| 133 | + </div> |
| 134 | + |
| 135 | + <div class="label">Pure HTML & CSS — 3D triangle (extruded)</div> |
| 136 | + </div> |
| 137 | +</body> |
| 138 | +</html> |
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