.button {
  background-color: #04AA6D;
  border: none;
  color: white;
  padding: 0px 2px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 2px 1px;
  transition-duration: 0.4s;
  cursor: pointer;
}

.button_green {
  background-color: white; 
  color: black; 
  border: 2px solid #04AA6D;
}

.button_green:hover {
  background-color: #04AA6D;
  color: white;
}

.button_blue {
  background-color: white; 
  color: black; 
  border: 2px solid #008CBA;
}

.button_blue:hover {
  background-color: #008CBA;
  color: white;
}

.button_red {
  background-color: white; 
  color: black; 
  border: 2px solid #f44336;
}

.button_red:hover {
  background-color: #f44336;
  color: white;
}

.button_gray {
  background-color: white;
  color: black;
  border: 2px solid #e7e7e7;
}

.button_gray:hover { 
  background-color: gray;
  color: white; 
}

.button_black {
  background-color: white;
  color: black;
  border: 2px solid #555555;
}

.button_black:hover {
  background-color: #555555;
  color: white;
}