body{
    background: black;
    color:white;
    margin: 20px;
    padding: 0;
    user-select: none;
    font-family: Arial Sans-Serif;
  }
button {
  background: yellowgreen;
    margin: 10px;
    color:white;
    font-weight:bold;
    font-size: 16px;
    cursor: pointer;
    padding: 10px;
    border:1px solid whitesmoke;
    border-radius:5px;
    
}
.dropdown {
    display: none;
    margin-left: 20px;
}