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              <div id="triangle-tutorial">
  <div class="steps">
    <div class="step-0">Imagine a box.</div>
    <div class="step-1">The box has a border-top.</div>
    <div class="step-2">It also has the other borders.</div>
    <div class="step-5">Notice how the borders meet each other at angles.</div>
    <div class="step-6">The background of the box is transparent.</div>
    <div class="step-7">The box is actually zero width and zero height.</div>
    <div class="step-8">Three of the borders are actually transparent in color.</div>
    <div class="step-11">That's how a CSS triangle is made!</div>
  </div>
  <div class="triangle-demo"></div>
  <div class="triangle-title" id="re-run">
      Run Again
  </div>
</div>


            
          
!
            
              @import url(https://fonts.googleapis.com/css?family=Montserrat:400,700);

body {
  margin: 0;
  background: #333;
  color: #fff;
  font-family: 'Montserrat', Arial, Helvetica, sans-serif;
  text-align: center;
}

#triangle-tutorial {
  margin-top: 35px;
}
.triangle-demo {
  width: 200px;
  height: 200px;
  margin: 0 auto;
  background: #e67e22;
  border-top: 0 solid #9b59b6;
  border-left: 0 solid #e74c3c;
  border-bottom: 0 solid #27ae60;
  border-right: 0 solid #2980b9;
  transition: 0.8s 0.2s;
}
.step-1 .triangle-demo {
  border-top-width: 20px;
}
.step-2 .triangle-demo {
  border-left-width: 20px;
}
.step-3 .triangle-demo {
  border-right-width: 20px;
}
.step-4 .triangle-demo {
  border-bottom-width: 20px;
}
.step-6 .triangle-demo {
  background: transparent;
}
.step-7 .triangle-demo {
  width: 0;
  height: 0;
}
.step-8 .triangle-demo {
  border-left-color: transparent;
}
.step-9 .triangle-demo {
  border-right-color: transparent;
}
.step-10 .triangle-demo {
  border-top-color: transparent;
}

.triangle-title {
  width: 200px;
  padding: 1rem;
  color: white;
  background: transparent;
  border: 2px solid #2ecc71;
  border-radius: 0;
  margin: 150px auto;
  opacity: 0;
  transition: 0.8s 0.2s;
  cursor: pointer;
}
.step-11 .triangle-title {
  opacity: 1;
}
.step-11 .triangle-demo {
  border-top-width: 100px;
  border-right-width: 100px;
  border-bottom-width: 100px;
  border-left-width: 100px;
  
  animation: rotateTriangle 1s;
}
.steps .step-0 {
  opacity: 1;
}
.step-1 .steps .step-1 {
  opacity: 1;
}
.step-2 .steps .step-2 {
  opacity: 1;
}
.step-5 .steps .step-5 {
  opacity: 1;
}
.step-6 .steps .step-6 {
  opacity: 1;
}
.step-7 .steps .step-7 {
  opacity: 1;
}
.step-8 .steps .step-8 {
  opacity: 1;
}
.step-11 .steps .step-11 {
  opacity: 1;
}
.steps {
  position: relative;
  height: 45px;
  font-size: 30px;
  margin-bottom: 30px;
}
.steps > div {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  background: #333;
  transition: 0.3s;
}

h1 {
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 1.5rem;
  color: #999;
}
hr {
  width: 100px;
  color: #95a5a6;
}

@keyframes rotateTriangle {
    from {
        transform: rotate(0);
    }
    to {
        transform: rotate(360deg);
    }
}


            
          
!
            
              (function () {
    var demo, run;
    demo = $('#triangle-tutorial');
    run = function () {
        setTimeout(function () {
            return demo.addClass('step-1');
        }, 2500);
        setTimeout(function () {
            return demo.addClass('step-2');
        }, 5000);
        setTimeout(function () {
            return demo.addClass('step-3');
        }, 5500);
        setTimeout(function () {
            return demo.addClass('step-4');
        }, 6000);
        setTimeout(function () {
            return demo.addClass('step-5');
        }, 7500);
        setTimeout(function () {
            return demo.addClass('step-6');
        }, 10000);
        setTimeout(function () {
            return demo.addClass('step-7');
        }, 12000);
        setTimeout(function () {
            return demo.addClass('step-8');
        }, 14000);
        setTimeout(function () {
            return demo.addClass('step-9');
        }, 14500);
        setTimeout(function () {
            return demo.addClass('step-10');
        }, 15000);
        return setTimeout(function () {
            return demo.addClass('step-11');
        }, 18000);
    };
    run();
    $('#re-run').on('click', function () {
        $('#triangle-tutorial').removeClass();
        return run();
    });
}.call(this));



            
          
!
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