anchor.diff:                  padding: 0;
                   height: 100%;
                   background-color: #000;
  +            }
  +            body {
                   background: url(/static/img/background_image.jpg);
                   background-size: cover;
                   background-attachment: fixed;
  
positive.code:             <a href="/">To the map service</a>
          </div>
  
          <div class="login-form">
              <c:if test="${error}">
                  <b style="color:red;">Wrong credentials</b>
  
negative.code:                 background-color: rgba(0, 0, 0, 0.5);
                  line-height: 1.3em;
              }
              @media (max-width: 420px) {
                  .login-information, .intro {
                      font-size: 15px;
                  }
              }
  
              .verticalSpacer {
                  /* content height 590px */
                  height: calc((100% - 590px) * 0.3)
              }
  
              .intro {
                  margin: 0 auto 30px auto;
              }
  
              input {
                  margin: 10px;
  