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About the <head>

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CSS

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CSS Base

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HTML 

              
                <div id="wrapper">
  <div id="spidercat">
    <div class="head">
      <div class="eye-left"></div>
      <div class="eye-right"></div>
      <div class="ear-left"></div>
      <div class="ear-right"></div>
    </div>
    <div class="body">
      <div class="spider"></div>
      <div class="arm-left"></div>
      <div class="arm-right"></div>
    </div>
    <div class="legs">
      <div class="boot-left"></div>
      <div class="boot-right"></div>
    </div>
  </div>
</div>
!

CSS 

              
                * {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}

*:before,
*:after{
  -webkit-box-sizing: content-box;
  -moz-box-sizing: content-box;
  box-sizing: content-box;
}

body {
  background: #fcdc58;
  text-align: center;
}

#wrapper {
  position: relative;
  margin-bottom: 10px;
  height: 300px;
}

#spidercat {
  -webkit-animation: swinganimation 3.5s infinite alternate;
  -moz-animation: swinganimation 3.5s infinite alternate;
  -ms-animation: swinganimation 3.5s infinite alternate;
  -o-animation: swinganimation 3.5s infinite alternate;
  animation: swinganimation 3.5s infinite alternate;
  position: absolute;
  width: 70px;
  height: 103px;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
}
#spidercat:before {
  content: " ";
  position: absolute;
  width: 0;
  height: 1000px;
  left: 50%;
  bottom: 100%;
  margin-bottom: -18px;
  margin-left: -1px;
  border: solid;
  border-width: 1px;
  border-color: white;
  z-index: 10;
}
#spidercat .head {
  -webkit-border-radius: 5px 5px 0 0;
  -moz-border-radius: 5px 5px 0 0;
  -ms-border-radius: 5px 5px 0 0;
  -o-border-radius: 5px 5px 0 0;
  border-radius: 5px 5px 0 0;
  position: absolute;
  width: 28px;
  height: 28px;
  bottom: 5px;
  left: 50%;
  margin-left: -14px;
  background: #ff6d36;
  border: solid 1px #1b405f;
  /* Neck */
}
#spidercat .head:before {
  content: " ";
  position: absolute;
  height: 4px;
  width: 8px;
  top: -6px;
  left: 50%;
  margin-left: -5px;
  background: #ff6d36;
  border: solid 1px #1b405f;
}
#spidercat .head .ear-left,
#spidercat .head .ear-right {
  position: absolute;
  width: 0;
  height: 0;
  top: 100%;
  border-style: solid;
  border-color: #1b405f transparent transparent transparent;
}
#spidercat .head .ear-left:before,
#spidercat .head .ear-right:before {
  content: " ";
  position: absolute;
  width: 0;
  height: 0;
  top: -6px;
  border-style: solid;
  border-color: #ff6d36 transparent transparent transparent;
}
#spidercat .head .ear-left {
  left: -1px;
  border-width: 6px 8px 0 0;
}
#spidercat .head .ear-left:before {
  left: 1px;
  border-width: 5px 5px 0 0;
}
#spidercat .head .ear-right {
  right: -1px;
  border-width: 6px 0 0 8px;
}
#spidercat .head .ear-right:before {
  right: 1px;
  border-width: 5px 0 0 5px;
}
#spidercat .head .eye-left,
#spidercat .head .eye-right {
  -webkit-animation: eyesanimation 1s infinite alternate;
  -moz-animation: eyesanimation 1s infinite alternate;
  -ms-animation: eyesanimation 1s infinite alternate;
  -o-animation: eyesanimation 1s infinite alternate;
  animation: eyesanimation 1s infinite alternate;
  -moz-border-radius-topleft: 50%;
  -webkit-border-top-left-radius: 50%;
  border-top-left-radius: 50%;
  -moz-border-radius-topright: 50%;
  -webkit-border-top-right-radius: 50%;
  border-top-right-radius: 50%;
  position: absolute;
  width: 9px;
  height: 2px;
  bottom: 9px;
  background: white;
  border: solid 1px #1b405f;
}
#spidercat .head .eye-left {
  left: 3px;
}
#spidercat .head .eye-right {
  right: 3px;
}
#spidercat .body {
  position: absolute;
  width: 32px;
  height: 34px;
  top: 34px;
  left: 50%;
  margin-left: -16px;
  background: #336687;
  border: solid 1px #1b405f;
  z-index: 2;
}
#spidercat .body:before {
  content: " ";
  position: absolute;
  top: 0;
  left: 4px;
  right: 4px;
  bottom: 0;
  background: #ff6d36;
}
#spidercat .body:after {
  content: " ";
  position: absolute;
  width: 36px;
  height: 6px;
  top: -7px;
  left: 50%;
  margin-left: -19px;
  background: #ff6d36;
  border: solid 1px #1b405f;
  z-index: 0;
}
#spidercat .body .spider {
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  -ms-border-radius: 50%;
  -o-border-radius: 50%;
  border-radius: 50%;
  position: absolute;
  width: 4px;
  height: 10px;
  left: 50%;
  bottom: 5px;
  margin-left: -2px;
  background: #1b405f;
}
#spidercat .body .spider:before, #spidercat .body .spider:after {
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  -ms-border-radius: 50%;
  -o-border-radius: 50%;
  border-radius: 50%;
  content: " ";
  position: absolute;
  width: 10px;
  height: 12px;
  left: 50%;
  margin-left: -6px;
  border-style: double;
  border-width: 1px;
}
#spidercat .body .spider:before {
  top: 50%;
  border-color: #1b405f transparent transparent transparent;
}
#spidercat .body .spider:after {
  bottom: 50%;
  border-color: transparent transparent #1b405f transparent;
}
#spidercat .body .arm-left,
#spidercat .body .arm-right {
  -webkit-border-radius: 6px;
  -moz-border-radius: 6px;
  -ms-border-radius: 6px;
  -o-border-radius: 6px;
  border-radius: 6px;
  -webkit-transform-origin: bottom center 0 50%;
  -moz-transform-origin: bottom center 0 50%;
  -ms-transform-origin: bottom center 0 50%;
  -o-transform-origin: bottom center 0 50%;
  transform-origin: bottom center 0 50%;
  position: absolute;
  width: 12px;
  height: 54px;
  bottom: -2px;
  background: #336687;
  border: solid 1px #1b405f;
  z-index: 1;
}
#spidercat .body .arm-left:before,
#spidercat .body .arm-right:before {
  -webkit-border-radius: 6px 6px 0 0;
  -moz-border-radius: 6px 6px 0 0;
  -ms-border-radius: 6px 6px 0 0;
  -o-border-radius: 6px 6px 0 0;
  border-radius: 6px 6px 0 0;
  content: " ";
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  bottom: 50%;
  background: #ff6d36;
  border: solid 1px #1b405f;
}
#spidercat .body .arm-left {
  -webkit-transform: rotate(20deg);
  -moz-transform: rotate(20deg);
  -ms-transform: rotate(20deg);
  -o-transform: rotate(20deg);
  transform: rotate(20deg);
  left: -9px;
  z-index: 2;
}
#spidercat .body .arm-right {
  -webkit-transform: rotate(-20deg);
  -moz-transform: rotate(-20deg);
  -ms-transform: rotate(-20deg);
  -o-transform: rotate(-20deg);
  transform: rotate(-20deg);
  right: -9px;
}
#spidercat .legs {
  -webkit-border-radius: 35px;
  -moz-border-radius: 35px;
  -ms-border-radius: 35px;
  -o-border-radius: 35px;
  border-radius: 35px;
  position: absolute;
  width: 70px;
  height: 28px;
  top: 6px;
  left: 50%;
  margin-left: -35px;
  background: transparent;
  border: solid 10px #1b405f;
  z-index: 0;
}
#spidercat .legs:before {
  -webkit-border-radius: 35px;
  -moz-border-radius: 35px;
  -ms-border-radius: 35px;
  -o-border-radius: 35px;
  border-radius: 35px;
  content: " ";
  position: absolute;
  width: 52px;
  height: 10px;
  top: -9px;
  left: 50%;
  margin-left: -34px;
  background: transparent;
  border: solid 8px #336687;
  z-index: 0;
}
#spidercat .legs .boot-left,
#spidercat .legs .boot-right {
  position: absolute;
  width: 19px;
  height: 12px;
  top: -11px;
  background: #ff6d36;
  border: solid 1px #1b405f;
}
#spidercat .legs .boot-left:before, #spidercat .legs .boot-left:after,
#spidercat .legs .boot-right:before,
#spidercat .legs .boot-right:after {
  content: " ";
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
}
#spidercat .legs .boot-left {
  right: 50%;
  margin-right: 1px;
}
#spidercat .legs .boot-left:before {
  top: -7px;
  right: -1px;
  border-color: transparent transparent #1b405f transparent;
  border-width: 0 0 7px 7px;
}
#spidercat .legs .boot-left:after {
  top: -5px;
  right: 0;
  border-color: transparent transparent #ff6d36 transparent;
  border-width: 0 0 5px 5px;
}
#spidercat .legs .boot-right {
  left: 50%;
  margin-left: 1px;
}
#spidercat .legs .boot-right:before {
  top: -7px;
  left: -1px;
  border-color: transparent transparent #1b405f transparent;
  border-width: 0 7px 7px 0;
}
#spidercat .legs .boot-right:after {
  top: -5px;
  left: 0;
  border-color: transparent transparent #ff6d36 transparent;
  border-width: 0 5px 5px 0;
}

@-webkit-keyframes eyesanimation {
  0% {
    height: 2px;
  }

  100% {
    height: 5px;
  }
}

@-moz-keyframes eyesanimation {
  0% {
    height: 2px;
  }

  100% {
    height: 5px;
  }
}

@-ms-keyframes eyesanimation {
  0% {
    height: 2px;
  }

  100% {
    height: 5px;
  }
}

@keyframes eyesanimation {
  0% {
    height: 2px;
  }

  100% {
    height: 5px;
  }
}

@-webkit-keyframes swinganimation {
  0% {
    -webkit-transform: translateY(-100px);
    -moz-transform: translateY(-100px);
    -ms-transform: translateY(-100px);
    -o-transform: translateY(-100px);
    transform: translateY(-100px);
  }

  100% {
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -ms-transform: translateY(0px);
    -o-transform: translateY(0px);
    transform: translateY(0px);
  }
}

@-moz-keyframes swinganimation {
  0% {
    -webkit-transform: translateY(-100px);
    -moz-transform: translateY(-100px);
    -ms-transform: translateY(-100px);
    -o-transform: translateY(-100px);
    transform: translateY(-100px);
  }

  100% {
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -ms-transform: translateY(0px);
    -o-transform: translateY(0px);
    transform: translateY(0px);
  }
}

@-ms-keyframes swinganimation {
  0% {
    -webkit-transform: translateY(-100px);
    -moz-transform: translateY(-100px);
    -ms-transform: translateY(-100px);
    -o-transform: translateY(-100px);
    transform: translateY(-100px);
  }

  100% {
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -ms-transform: translateY(0px);
    -o-transform: translateY(0px);
    transform: translateY(0px);
  }
}

@keyframes swinganimation {
  0% {
    -webkit-transform: translateY(-100px);
    -moz-transform: translateY(-100px);
    -ms-transform: translateY(-100px);
    -o-transform: translateY(-100px);
    transform: translateY(-100px);
  }

  100% {
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -ms-transform: translateY(0px);
    -o-transform: translateY(0px);
    transform: translateY(0px);
  }
}
!

JS 

              
                /* 
Spidercat, spidercat! Does whatever a Spidercat does..
Made by Kevin Jannis (@kevinjannis)
View more at www.janniskev.in 
*/
!
999px

Console