body {
  padding: 50px;
  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
}

a {
  color: #00B7FF;
}

label{
  display: block;
  margin-top: 10px;
}
/* input:valid{
  background-color: palegreen;
}

input:invalid{
  background-color: lightpink;
} */

#_input input{
  float: left;
  margin-top: 10px;
  width:100%;
}