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HTML 

              
                <div class="center">

  <h1>Cool Button</h1>

  <a href="#" class="button">
    <div class="bottom"></div>
    <div class="top">
      <div class="label">Click Me (#1)</div>
      <div class="button-border button-border-left"></div>
      <div class="button-border button-border-top"></div>
      <div class="button-border button-border-right"></div>
      <div class="button-border button-border-bottom"></div>
    </div>
  </a>

  <a href="#" class="button2">Click Me (#2)</a>
  <a href="#" class="button3">Click Me (#3)</a>

  <p>Above you can see button#1 with all effects visible, like the changing of color (transition) of the 4 seperate borders. Button#2 is the simple version, coded with :before pseudo-element, big difference is that I'm using outline here instead of the border-property used in button#1. Button#3 is even WCAG2.0 compliant because the background is no longer a :before pseude-element and therefor you now have color-contrast (in this example the color-contrast is too low).
  
  <p>Button#2 and button#3 are way easier to embed in a CMS with dynamical input and easier to maintain. I had to code button#2 and button#3 with an outline to maintain the visual effect of overlapping. If you use the border property in the button#2 and button#3 the (orange) background would overlap the border.

  <div class="background">

    <a href="#" class="button">
      <div class="bottom"></div>
      <div class="top">
        <div class="label">Click Me (#1)</div>
        <div class="button-border button-border-left"></div>
        <div class="button-border button-border-top"></div>
        <div class="button-border button-border-right"></div>
        <div class="button-border button-border-bottom"></div>
      </div>
    </a>

    <a href="#" class="button2">Click Me (#2)</a>
    <a href="#" class="button3">Click Me (#3)</a>

  </div>

</div>
!

CSS 

              
                *,
*:before,
*:after {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}
.center {
  text-align: center;
}

p { line-height: 140%; }
.background {
  background: rgba(0,0,0,.4);
}
.button {
  display: inline-block;
  text-decoration: none;
  position: relative;
  margin: 40px 12px;
  z-index: 0;
  transition: background .3s ease;
}
.button .bottom {
  position: absolute;
  left: 7px;
  top: 7px;
  width: 100%;
  height: 100%;
  background-color: #ed9121;
  display: block;
  -webkit-transition: all 0.15s ease-out;
  -moz-transition: all 0.15s ease-out;
  -o-transition: all 0.15s ease-out;
  transition: all 0.15s ease-out;
}
.button .top .label {
  font-family: sans-serif;
  font-weight: 400;
  color: #FFF;
  font-size: 12px;
  line-height: 110%;
  letter-spacing: 2px;
  text-align: center;
  text-transform: uppercase;
  -webkit-transition: all 0.15s ease-out;
  -moz-transition: all 0.15s ease-out;
  -o-transition: all 0.15s ease-out;
  transition: all 0.15s ease-out;
}
.button-border {
  position: absolute;
  background-color: #ceab6a;
  -webkit-transition: all 0.25s ease-out;
  -moz-transition: all 0.25s ease-out;
  -o-transition: all 0.25s ease-out;
  transition: all 0.25s ease-out;
}
.button-border-left {
  left: -2px;
  bottom: -2px;
  width: 2px;
  height: 0;
}
.button-border-top {
  left: -2px;
  top: -2px;
  width: 0;
  height: 2px;
}
.button-border-right {
  right: -2px;
  top: -2px;
  width: 2px;
  height: 0;
}
.button-border-bottom {
  right: -2px;
  bottom: -2px;
  width: 0;
  height: 2px;
}
.button .top {
  position: relative;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  padding: 24px 34px 22px 34px;
  border: 2px solid #0c4a45;
}

.button:hover .bottom {
  left: 0;
  top: 0;
  background-color: #f3f3f3;
}
.button-dark:hover .bottom {
  background-color: #111;
  background-color: rgba(17, 17, 17, 0.8);
}
.button:hover .top .label {
  color: #0c4a45;
}
.button-border {
  position: absolute;
  background-color: #ed9121;
  -webkit-transition: all 0.25s ease-out;
  -moz-transition: all 0.25s ease-out;
  -o-transition: all 0.25s ease-out;
  transition: all 0.25s ease-out;
}
.button:hover .top .button-border-left,
.button:hover .top .button-border-right {
  height: calc(100% + 2px);
}
.button:hover .top .button-border-top,
.button:hover .top .button-border-bottom {
  width: calc(100% + 2px);
}


.button2 {
  display: inline-block;
  text-decoration: none;
  position: relative;
  margin: 40px 12px;
  padding: 24px 34px 22px 34px;
  outline: 3px solid #0c4a45;
  font-family: sans-serif;
  font-weight: 400;
  color: #FFF;
  font-size: 12px;
  line-height: 110%;
  letter-spacing: 2px;
  text-align: center;
  text-transform: uppercase;
  z-index: 1;
}

.button2:before {
  content: "";
  position: absolute;
  left: 7px;
  top: 7px;
  width: calc(100% + 2px);
  height: calc(100% + 2px);
  background-color: #ed9121;
  display: block;
  z-index: -1;
  -webkit-transition: all 0.3s ease-out;
  -moz-transition: all 0.3s ease-out;
  -o-transition: all 0.3s ease-out;
  transition: all 0.3s ease-out;
}

.button2:hover {
  color: #000;
  outline: 3px solid #ed9121;
}
.button2:hover:before {
  top: 0;
  left: 0;
  background: #FFF;
}

.button3 {
  display: inline-block;
  text-decoration: none;
  position: relative;
  margin: 40px 12px;
  padding: 24px 34px 22px 34px;
  background-color: #ed9121;
  font-family: sans-serif;
  font-weight: 400;
  color: #FFF;
  font-size: 12px;
  line-height: 110%;
  letter-spacing: 2px;
  text-align: center;
  text-transform: uppercase;
  z-index: 1;
}

.button3:before {
  content: "";
  position: absolute;
  left: 7px;
  top: 7px;
  width: calc(100% - 4px);
  height: calc(100% - 4px);
  outline: 3px solid #0c4a45;
  display: block;
  z-index: -1;
  -webkit-transition: all 0.3s ease-out;
  -moz-transition: all 0.3s ease-out;
  -o-transition: all 0.3s ease-out;
  transition: all 0.3s ease-out;
}

.button3:hover {
  color: #000;
  
}
.button3:hover:before {
  top: 2px;
  left: 2px;
  background: #FFF;
  outline: 3px solid #ed9121;
}


h1 {
  margin: 24px 5% 32px;
  font-size: 32px;
  font-weight: 700;
  text-align: center;
}
p {
  margin: 0 5% 24px;
}
!

JS
!
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