```css

button {

background-color: #4CAF50;

color: white;

padding: 10px 20px;

border: none;

border-radius: 5px;

cursor: pointer;

font-size: 16px;

text-align: center;

button:hover {

background-color: #3e8e41;

display: block;

margin: 0 auto;

width: 20px;

height: 20px;

font-size: 12px;

border: 2px solid #4CAF50;

border-radius: 4px;

cursor: pointer;

background-color: #4CAF50;

background-color: #3e8e41;