.button {
  background-color: #4E4E4E;  
  border: none;
  color: white;
  padding: 12px 12px ;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  border-radius: 47%; 
}  
.buttonOS  {
  background-color: #4E4E4E;  
  border: none;
  color: white;
  padding:  2px  9px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 20px;
  border-radius: 50%; 
}  
.buttonSettings {
  background-color: #4E4E4E;  
  border: none;
  color: white;
  padding:  2px  9px;
  text-align: left;
  text-decoration: none;
  display: inline-block;
  font-size: 20px;
  border-radius: 0%; 
} 
.buttonCOLOR {
  background-color: #4E4E4E;  
  border: none;
  color: white;
  padding:  2px  10px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 20px;
  border-radius: 50%; 
}