body {
    background-image: url("http://listsurge.com/wp-content/uploads/2015/09/Education-important.jpg");
    background-size: 100%;
    background-repeat: no-repeat;
}
h1 {text-align: center; font-size: 50px;}
h2 {text-align:center; font-size: 35px;}
form {text-align:center;}
button{
  margin:auto;
  display:block;
}

 

.student { height: 40px;
   width:70px;}
   
.teacher { height: 40px;
   width:70px;}