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HTML

              
                main
            header.accessible-hide
                h1 CSS 403 Error
            .flexy-center
                .button__container
                    #connect.button Connect
                    #reload.button.button--disabled Reload
                #container.container
                    svg#computer.computer.svg-icon(xmlns='http://www.w3.org/2000/svg', width='1024', height='1024', viewbox='0 0 1024 1024')
                        path(d='M864 159.872L160 160c-17.696 0-32 14.176-32 31.872v448c0 17.696 14.304 32 32 32h704c17.696 0 32-14.304 32-32v-448c0-17.696-14.304-32-32-32zM864 640H160V191.872h704V640zm64-608H96C42.976 32 0 74.944 0 128v640c0 52.928 42.816 95.808 95.68 95.936H416v38.944l-199.744 25.952C201.984 932.384 192 945.184 192 959.872c0 17.696 14.304 32 32 32h576c17.696 0 32-14.304 32-32 0-14.688-9.984-27.488-24.256-31.072L608 902.88v-38.944h320.32c52.864-.128 95.68-43.008 95.68-95.936V128c0-53.056-43.008-96-96-96zm32 736c0 17.632-14.368 32-32 32H96c-17.664 0-32-14.368-32-32V128c0-17.664 14.336-32 32-32h832c17.632 0 32 14.336 32 32v640z')
                    svg#server.server.svg-icon(xmlns='http://www.w3.org/2000/svg', width='1024', height='1024', viewbox='0 0 1024 1024')
                        path(d='M512 0C296.192 0 64 65.056 64 208v608c0 142.88 232.192 208 448 208 215.776 0 448-65.12 448-208V208C960 65.056 727.744 0 512 0zm384 816c0 79.488-171.936 144-384 144-212.096 0-384-64.512-384-144V696.448C194.112 764.576 353.6 800 512 800s317.888-35.424 384-103.552V816zm0-192h-.128c0 .32.128.672.128.992C896 704 724.064 768 512 768s-384-64-384-143.008c0-.32.128-.672.128-.992H128V504.448C194.112 572.576 353.6 608 512 608s317.888-35.424 384-103.552V624zm0-192h-.128c0 .32.128.672.128.992C896 512 724.064 576 512 576s-384-64-384-143.008c0-.32.128-.672.128-.992H128V322.048C211.872 385.952 365.6 416 512 416s300.128-30.048 384-93.952V432zm-384-80c-212.096 0-384-64.512-384-144 0-79.552 171.904-144 384-144 212.064 0 384 64.448 384 144 0 79.488-171.936 144-384 144zm256 480c0-17.673 14.327-32 32-32s32 14.327 32 32c0 17.673-14.327 32-32 32s-32-14.327-32-32zm0-192c0-17.673 14.327-32 32-32s32 14.327 32 32c0 17.673-14.327 32-32 32s-32-14.327-32-32zm0-192c0-17.673 14.327-32 32-32s32 14.327 32 32c0 17.673-14.327 32-32 32s-32-14.327-32-32z')
                    #response.response
                        .item 4
                        .item 0
                        .item 3
                        .sparks
                #container__title.container__title Forbidden

              
            
!

CSS

              
                @charset 'utf-8';
@import 'compass/reset';
@import url('https://fonts.googleapis.com/css?family=Bree+Serif');
@import url('https://fonts.googleapis.com/css?family=Open+Sans:300');

$white      : #ecf0f1;
$black      : #1f1f1f;
$lightGray  : #cfcfcf;
$red        : #e74c3c;
$blue       : #2c3e50;
$green      : #27ae60;

$baseDuration: .45s;
$fastDuration: $baseDuration / 2;
$slowDuration: $baseDuration * 2;

$lineHeight: 1.4rem;
$basePadding: $lineHeight;

html,
body,
main {
    height: 100%;
    width: 100%;
    box-sizing: border-box;
    -webkit-overflow-scrolling: touch;
}

body {
    font-size: 1em;
    line-height: $lineHeight;
    color: $white;
    background-color: $blue;
    font-family: 'Open Sans', sans-serif;
}

.accessible-hide {
    position: absolute;
    height: 0;
    width: 0;
    overflow: hidden;
}

.flexy-center {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
}

.svg-icon {
    width: 1em;
    height: 1em;
    fill: $white;
    &:nth-of-type(1) {
        transform: translate(-.55em);
    }
    &:nth-of-type(2) {
        transform: translate(.55em);
    }
}

.button {
    padding: ($lineHeight / 2) $lineHeight;
    border-radius: .2em;
    background-color: $green;
    margin: 0 $lineHeight;
    transition: all $fastDuration ease-in-out;
    cursor: pointer;
    &__container {
        display: flex;
    }
    &--disabled {
        pointer-events: none;
        opacity: .2;
    }
}

$itemWidth: .7em;
$boxWidth : 3em;
$containerWidth: 5em;
$totalDuration: $slowDuration;
$queryDelay: ($totalDuration * 70) / 100;
$queryDuration: $totalDuration - $queryDelay;
$responseDelay: ($totalDuration * 95) / 100;

.container {
    font-size: 3em;

    height: .45em;

    width: $containerWidth;
    margin-top: ($lineHeight * 5);
    perspective: 1200px;

    position: relative;
    display: flex;
    align-items: flex-end;
    justify-content: space-between;

    background-image: radial-gradient($white .015em, transparent .02em);
    background-size: .25em .25em;
    background-repeat: repeat-x;
    background-position: 0 bottom;
    transition: all ($slowDuration * 3) ease-in-out;

    &__title {
        margin-top: 1em;
        font-size: 2em;
        opacity: 0;
        transition: opacity $fastDuration ease-in-out;
        &--anim {
            opacity: 1;
        }
    }
    &__anim {
        background-position: 200% bottom;
    }
    &:before {
        content: '';
        height: 1em;
        width: calc(100% + .15em);
        position: absolute;
        left: -.075em;
        bottom: -.48em;
        box-sizing: border-box;
        padding-bottom: .25em;
        border-radius: 0 0 .25em .25em;

        border: .05em solid white;
        border-bottom-color: transparent;
        border-top-color: transparent;

        transform-style: preserve-3d;
        transform-origin: 50% 0;
        transform: rotateX(63deg);
    }
    &__jump {
        .response {
            animation: responseMove ($slowDuration * 1.25) ease-out forwards;
            .item {
                opacity: 1;
                animation: $slowDuration linear forwards;
                animation-delay: $fastDuration / 2;
                &:nth-child(1) {
                    animation-name: jump4;
                }
                &:nth-child(2) {
                    animation-name: jump0;
                }
                &:nth-child(3) {
                    animation-name: jump3;
                }
            }
            .sparks {
                transform: scale(2);
                opacity: 0;
                background-color: $red;
            }
        }
        .server {
            fill: $red;
        }
        background-image: radial-gradient($red .015em, transparent .02em);
        &:before {
            border-right-color: $red;
        }
    }
    .svg-icon {
        position: absolute;
        bottom: 100%;
        &:nth-of-type(1) {
            left: 0;
        }
        &:nth-of-type(2) {
            right: 0;
        }
    }
}


.response {
    position: absolute;
    right: -.5em;
    top: -1em;
    .item {
        opacity: 0;
        line-height: 1em;
        font-family: 'Bree Serif', serif;
    }
}

.sparks {
    width: 1em;
    height: 1em;
    border-radius: 1em;
    background-color: white;
    transform: scale(0);
    transition: all $fastDuration ease-out;
}

.item {
    top: 0;
    right: 0;
    position: absolute;
    width: $itemWidth;
    z-index: 2;
    text-align: center;
    transition: all $baseDuration ease-out;
    display: flex;
    align-items: center;
    line-height: .87em;
    justify-content: center;
}

@keyframes responseMove {
    100% {
        transform: translate(-2.5em, .7em) scale(1.5);
    }
}

@keyframes jump4 {
    0% {
        transform: translateY(0) translateX(0) rotate(0);
        animation-timing-function: ease-out;
    }
    50% {
        transform: translateY(-3em) translateX(-.35em) rotate(-340deg);
        animation-timing-function: ease-in;
    }
    70% {
        transform: translateY(0) translateX(-.45em) rotate(-360deg);
        animation-timing-function: ease-out;
    }
    80% {
        transform: translateY(-1em) translateX(-.55em) rotate(-360deg);
        animation-timing-function: ease-in;
    }
    90%,
    100% {
        transform: translateY(0) translateX(-.65em) rotate(-360deg);
        animation-timing-function: ease-out;
        color: $red
    }
}
@keyframes jump0 {
    0% {
        transform: translateY(0) translateX(0) rotate(0);
        animation-timing-function: ease-out;
    }
    50% {
        transform: translateY(-2em) translateX(-.1em) rotate(-700deg);
        animation-timing-function: ease-in;
    }
    70% {
        transform: translateY(0) translateX(-.1em) rotate(-720deg);
        animation-timing-function: ease-out;
    }
    80% {
        transform: translateY(-.5em) translateX(-.1em) rotate(-720deg);
        animation-timing-function: ease-in;
    }
    90%,
    100% {
        transform: translateY(0) translateX(-.1em) rotate(-720deg);
        animation-timing-function: ease-out;
        color: $red
    }
}
@keyframes jump3 {
    0% {
        transform: translateY(0) translateX(0) rotate(0);
        animation-timing-function: ease-out;
    }
    50% {
        transform: translateY(-3em) translateX(.1em) rotate(-340deg);
        animation-timing-function: ease-in;
    }
    70% {
        transform: translateY(0) translateX(.2em) rotate(-360deg);
        animation-timing-function: ease-out;
    }
    80% {
        transform: translateY(-1em) translateX(.3em) rotate(-360deg);
        animation-timing-function: ease-in;
    }
    90%,
    100% {
        transform: translateY(0) translateX(.4em) rotate(-360deg);
        animation-timing-function: ease-out;
        color: $red
    }
}





              
            
!

JS

              
                var computer = $('#computer'),
  response = $('#response'),
  connect = $('#connect'),
  reload = $('#reload'),
  container = $('#container'),
  containerTit = $('#container__title');

connect.click(function() {
  $(this).toggleClass('button--disabled');
  reload.toggleClass('button--disabled');
  container.addClass('container__anim');
  container.one('webkitTtransitionEnd otransitionend msTransitionEnd transitionend', function() {
    container.addClass('container__jump');
    container.one('webkitAnimationEnd oanimationend msAnimationEnd animationend', function() {
      containerTit.addClass('container__title--anim')
    });
  });
});

reload.click(function() {
  $(this).toggleClass('button--disabled');
  connect.toggleClass('button--disabled');
  container.removeClass('container__anim');
  container.removeClass('container__jump');
  containerTit.removeClass('container__title--anim');
});
              
            
!
999px

Console