extend.out.css

button,
a.join,
a.button
input[type='submit'],
input[type='button'] {
  padding: 5px 10px;
  border: 1px solid #eee;
  border-bottom-color: #ddd
}

.green,
a.join {
  background: green;
  padding: 10px 15px
}

a.join {

}

a.button
input[type='submit'],
input[type='button'] {
  margin: 2px
}