.article-button {
  display: flex;
  flex-direction: column;  
  justify-content: center;
  position: relative;
}

.greenBtn {
  padding: 10px 20px;
  color: white;
  text-decoration: none;
  text-decoration: none;  
  height: 50px;
  margin-bottom: 20px;
  display: flex;
  justify-content: center; 
  align-items: center;
  transition: all 0.3s ease-in-out;
  background-color: green;
}

.greenBtn:hover {
  color: white;
}