-webkit-keyframes show {

      from,
      40% {
        opacity: 0;
      }

      41%,
      to {
        opacity: 0.8;
      }
    }

    @keyframes show {

      from,
      40% {
        opacity: 0;
      }

      41%,
      to {
        opacity: 0.8;
      }
    }
  </style>
</head>

<body>
  <div class="loader">
    <span class="loader-block"></span>
    <span class="loader-block"></span>
    <span class="loader-block"></span>
    <span class="loader-block"></span>
    <span class="loader-block"></s