body {
  width:70%;
  margin:auto;
  text-align:center;
  font-size:1.5em;
}

form {
  margin-top:2%;
}

fieldset {
  padding:2em;
  border:1px dashed;
}

input {
  border:1px solid lightgray;
  height:2em;
  text-align:center;
  font-size:1.2em;
  padding:0.1em;
  margin:0.1em;
}

input[type='submit'] {
  height: 2.2em;
  padding: 0.1em 0.4em;
  cursor: pointer;
}
input[type='submit']:hover {
  background-color: green;
}

label {
  display:none;
}