#btn2{

  border: none;

  border-radius: 5px;

  color: white;

  width: 80px;

  height: 30px;

  background-color: red;

  cursor: pointer;

}



#btn3{

  border: none;

  border-radius: 5px;

  color: white;

  width: 80px;

  height: 30px;

  background-color: blue;

  cursor: pointer;

  transition-duration: 0.4s;

}



#btn3:hover{

  background-color: yellow;

  color: black;

}



#btn4{

  background-color: white;

  color: black;

  border: 2px solid #04AA6D; /* Green */

  width: 80px;

  height: 30px;

  border-radius: 5px;

}