body, html {
    height: 100%;
    font-family: Arial, Helvetica, sans-serif;
  }
  
  * {
    box-sizing: border-box;
  }
  
  /*styling background image*/
  .bg-img {
  
    background-image: url("image/DN3.jpg");
    width : 100%;
    min-height: 100%;
  
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
  }
  /*end*/
  
  /*styling kotak form*/
  .container {
    position: absolute;
    right: 0;
    margin: 20px;
    max-width: 300px;
    max-height: 100%;
    padding: 16px;
    background-color: #F5FFFA;
    box-shadow: 0 6px 20px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    border-radius: 20px;
  }
  
  .container h2{
    text-align : center;
  }
  
  input[type=text], input[type=password] {
    width: 100%;
    padding: 15px;
    margin: 5px 0 22px 0;
    border: none;
    background: #708090;
  }
  
  input[type=text]:focus, input[type=password]:focus {
    background-color:#AFEEEE;
    outline: none;
  }
  
  /*end*/

  /*styling button*/
  .btn {
    background-color: #26a69a;
    color: white;
    border: none;
    cursor: pointer;
    width: 100%;
    opacity: 0.9;
    margin-top : 15px;
  }
  
  .btn:hover {
    opacity: 1;
  }
  
  /*teknik button agar jika di klik menimbulkan effect tombol tertekan*/
  button:hover {background-color:  #AFEEEE}
  button:active {
    box-shadow: 0 5px grey;
    transform: translateY(4px);
  }
  
  @media screen and (max-width: 641px) {

    .container{
      margin-right : 100px;
      margin-top: 150px;
    }
 }