* {box-sizing: border-box}

    /* Add padding to containers */
    .container {
      padding: 16px;
    }
    
    /* Full-width input fields */
    input[type=text], input[type=password] {
      width: 100%;
      padding: 15px;
      margin: 5px 0 22px 0;
      display: inline-block;
      border: none;
      background: #f1f1f1;
    }
    
    input[type=text]:focus, input[type=password]:focus {
      background-color: #ddd;
      outline: none;
    }
    
    /* Overwrite default styles of hr */
    hr {
      border: 1px solid #f1f1f1;
      margin-bottom: 25px;
    }
    
    /* Set a style for the submit/register button */
    .registerbtn {
      background-color: #4CAF50;
      color: white;
      padding: 16px 20px;
      margin: 8px 0;
      border: none;
      cursor: pointer;
      width: 100%;
      opacity: 0.9;
    }
    
    .registerbtn:hover {
      opacity:1;
    }
    
    /* Add a blue text color to links */
    a {
      color: dodgerblue;
    }
    
    /* Set a grey background color and center the text of the "sign in" section */
    .signin {
      background-color: #f1f1f1;
      text-align: center;
    }