Довольно любопытная и красивая легкая анимация средствами html + css

Для корректной работы предварительно требуется скачать шрифт Monoton

                        
HTML:



<link href='http://fonts.googleapis.com/css?family=Monoton' rel='stylesheet' type='text/css'>

<div>

  <p id="error">E<span>r</span>ror</p>

  <p id="code">4<span>0</span><span>4</span></p>

</div>



CSS:



body { background-color: #111111; }

div {

  padding: 40px;

  font-size: 75px;

  font-family: 'Monoton', cursive;

  text-align: center;

  text-transform: uppercase;

  text-shadow: 0 0 80px red,0 0 30px FireBrick,0 0 6px DarkRed;

  color: red;

}

div p { margin:0; }

#error:hover { text-shadow: 0 0 200px #ffffff,0 0 80px #008000,0 0 6px #0000ff; }

#code:hover { text-shadow: 0 0 100px red,0 0 40px FireBrick,0 0 8px DarkRed; }

#error {

  color: #fff;

  text-shadow: 0 0 80px #ffffff,0 0 30px #008000,0 0 6px #0000ff;

}

#error span {

  animation: upper 11s linear infinite;

}

#code span:nth-of-type(2) {

  animation: lower 10s linear infinite;

}

#code span:nth-of-type(1) {

  text-shadow: none;

  opacity:.4;

}

@keyframes upper {

  0%,19.999%,22%,62.999%,64%, 64.999%,70%,100% {

    opacity:.99; text-shadow: 0 0 80px #ffffff,0 0 30px #008000,0 0 6px #0000ff;

  }

  20%,21.999%,63%,63.999%,65%,69.999% {

    opacity:0.4; text-shadow: none; 

  }

}

@keyframes lower {

  0%,12%,18.999%,23%,31.999%,37%,44.999%,46%,49.999%,51%,58.999%,61%,68.999%,71%,85.999%,96%,100% {

    opacity:0.99; text-shadow: 0 0 80px red,0 0 30px FireBrick,0 0 6px DarkRed;

  }

  19%,22.99%,32%,36.999%,45%,45.999%,50%,50.99%,59%,60.999%,69%,70.999%,86%,95.999% { 

    opacity:0.4; text-shadow: none; 

  }

}