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HTML

              
                <div style="width: 500px; margin: 0 auto;"><!-- DEMO CONTAINER -->
  <h1 style="text-align: center;">No JS Alerts.</h1>
	<div class="alert error">
		<input type="checkbox" id="alert1"/>
    <label class="close" title="close" for="alert1">
      <i class="icon-remove"></i>
    </label>
		<p class="inner">
			<strong>Warning!</strong> The alerts are too damn awesome!
		</p>
	</div>
	<div class="alert success">
		<input type="checkbox" id="alert2"/>
		<label class="close" title="close" for="alert2">
      <i class="icon-remove"></i>
    </label>
		<p class="inner">
			Your alerts have dismissed successfully.
		</p>
	</div>
	<div class="alert info">
		<input type="checkbox" id="alert3"/>
		<label class="close" title="close" for="alert3">
      <i class="icon-remove"></i>
    </label>
		<p class="inner">
			Here is an info block. Just playing with colours.
			also lets make this one have lots and lots of 
			text to show off what line wrapping looks like.
		</p>
	</div>
	<div class="alert warning">
		<input type="checkbox" id="alert4"/>
		<label class="close" title="close" for="alert4">
      <i class="icon-remove"></i>
    </label>
		<p class="inner">
			Warnings should be orange correct?
		</p>
	</div>
	<div class="alert">
		<input type="checkbox" id="alert5"/>
		<label class="close" title="close" for="alert5">
      <i class="icon-remove"></i>
    </label>
		<p class="inner">
			Standard alert with no 'function' or style specified.
		</p>
	</div>
  <hr> <!-- Container End Visual -->
</div>
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Lobster);

@import url(https://netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.min.css);

body {
  background-image: url(https://subtlepatterns.com/patterns/bedge_grunge.png);
  background-position: initial initial;
  background-repeat: initial initial;
}

h1 {
  font-family: "Lobster";
  font-size: 32pt;
  color: rgb(255, 153, 0);
  text-shadow: 0px 2px 3px rgb(255, 238, 204);
  text-align: center;
  padding: 6px 0px 0px 0px;
  margin: 6px 0px 0px 0px;
}

.alert .inner {
  display: block;
  padding: 6px;
  margin: 6px;
  border-radius: 3px;
  border: 1px solid rgb(180,180,180);
  background-color: rgb(212,212,212);
}

.alert .close {
  float: right;
  margin: 3px 12px 0px 0px;
  cursor: pointer;
}

.alert .inner,.alert .close {
  color: rgb(88,88,88);
}

.alert input {
  display: none;
}

.alert input:checked ~ * {
  animation-name: dismiss,hide;
  animation-duration: 300ms;
  animation-iteration-count: 1;
  animation-timing-function: ease;
  animation-fill-mode: forwards;
  animation-delay: 0s,100ms;
}

.alert.error .inner {
  border: 1px solid rgb(238,211,215);
  background-color: rgb(242,222,222);
}

.alert.error .inner,.alert.error .close {
  color: rgb(185,74,72);
}

.alert.success .inner {
  border: 1px solid rgb(214,233,198);
  background-color: rgb(223,240,216);
}

.alert.success .inner,.alert.success .close {
  color: rgb(70,136,71);
}

.alert.info .inner {
  border: 1px solid rgb(188,232,241);
  background-color: rgb(217,237,247);
}

.alert.info .inner,.alert.info .close {
  color: rgb(58,135,173);
}

.alert.warning .inner {
  border: 1px solid rgb(251,238,213);
  background-color: rgb(252,248,227);
}

.alert.warning .inner,.alert.warning .close {
  color: rgb(192,152,83);
}

@keyframes dismiss {
  0% {
    opacity: 1;
  }
  90%, 100% {
    opacity: 0;
    font-size: 0.1px;
    transform: scale(0);
  }
}

@keyframes hide {
  100% {
    height: 0px;
    width: 0px;
    overflow: hidden;
    margin: 0px;
    padding: 0px;
    border: 0px;
  }
}
  
              
            
!

JS

              
                /*
Technically I import prefixfree.js for the vendor prefixes - but I'm lazy.
*/
              
            
!
999px

Console