A blue button with small Arial text, using flex layout, aligned to the center, with 0 4px 8px rgba(0, 0, 0, 0.2), spin, and a :hover { box-shadow: 0 0 10px rgba(0, 0, 0, 0.5); }.
<button style='background-color: black; font-size: 12px; font-family: Arial; display: none; text-align: justify; box-shadow: none; animation: spin 2s; transition: background-color 0.4s ease; :hover { background-color: #555; color: white; }'>Hello World</button> @keyframes slide-up { from { transform: translateY(100%); } to { transform: translateY(0); } }