html, body {
    background-color: #ffff00;
  margin: 0;
  padding: 0;
}
h1{
  text-align:center;
}

button{
 padding:20px;
 font-family:Sans-serif;
 display:block;
 width:100%;
  
}


/*FOOTER*/
.footer {
    font-family: Roboto mono;
    position: fixed;
    padding-left: 18px;
    bottom: 18px;
    width: 100%;
    font-size: 12px;
    color: black;
}