How do I make my slider autoplay in a loop?

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HTML5

PC

I haven't made the code from the bottom myself. I leant it from http://cssdeck.com/labs/css3-image-slider[^]

But I've changed the code to match what I wanted. The only thing I can't get it to do, is to automatically change slide, and when it's reached the last slide, I want it to go in a loop and slide to the first image again.
I know sliders are probably easier in bootstrap or even with js, but I'd really like to be able to manage these problems in only HTML/CSS.
Here's my JSFiddle, though no JS has been used: http://jsfiddle.net/jaxttde6/[^]


HTML:

<div id="slideshow-wrap">
           <input type="radio" id="button-1" name="controls" checked="checked" />
           <label for="button-1"></label>
           <input type="radio" id="button-2" name="controls" />
           <label for="button-2"></label>
           <input type="radio" id="button-3" name="controls" />
           <label for="button-3"></label>
           <input type="radio" id="button-4" name="controls" />
           <label for="button-4"></label>
           <input type="radio" id="button-5" name="controls" />
           <label for="button-5"></label>
           <div id="slideshow-inner">
               <ul>
                   <li id="slide1">
                       <img src="http://i59.tinypic.com/vxlzef.jpg" />
                   </li>
                   <li id="slide2">
                       <img src="http://i62.tinypic.com/svgirp.jpg" />
                   </li>
                   <li id="slide3">
                       <img src="http://i59.tinypic.com/311pe1d.jpg" />
                   </li>
                   <li id="slide4">
                       <img src="http://i58.tinypic.com/10i9imd.jpg" />
                   </li>
                   <li id="slide5">
                       <img src="http://i58.tinypic.com/s1qm1d.jpg" />
                   </li>
               </ul>
           </div>
       </div>

CSS:

#slideshow-wrap {
    display: block;
    height: 300px;
    min-width: 260px;
    max-width: 960px;
    margin: auto;
    margin-top: 45px;
    position: relative;
}

#slideshow-inner {
    width: 100%;
    height: 100%;
    background-color: rgb(0,0,0);
    overflow: hidden;
    position: relative;
}

#slideshow-inner>ul {
    list-style: none;
    height: 100%;
    width: 500%;
    overflow: hidden;
    position: relative;
    left: 0px;
    -webkit-transition: left .8s cubic-bezier(0.77, 0, 0.175, 1);
    -moz-transition: left .8s cubic-bezier(0.77, 0, 0.175, 1);
    -o-transition: left .8s cubic-bezier(0.77, 0, 0.175, 1);
    transition: left .8s cubic-bezier(0.77, 0, 0.175, 1);
}

#slideshow-inner>ul>li {
    width: 20%;
    height: 300px;
    float: left;
    position: relative;
}

#slideshow-inner>ul>li>img {
    margin: auto;
    height: 100%;
}

#slideshow-wrap input[type=radio] {
    position: absolute;
    left: 50%;
    bottom: 15px;
    z-index: 100;
    visibility: hidden;
}

#slideshow-wrap label:not(.arrows):not(.show-description-label) {
    position: absolute;
    left: 50%;
    bottom: 20px;
    z-index: 100;
    width: 12px;
    height: 12px;
    background-color: #feffe1;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
    cursor: pointer;
    -webkit-transition: background-color .2s;
    -moz-transition: background-color .2s;
    -o-transition: background-color .2s;
    transition: background-color .2s;
}

#slideshow-wrap label:not(.arrows):active { bottom: 20px }

#slideshow-wrap input[type=radio]#button-1:checked~label[for=button-1] { background-color: rgba(100,100,100,1) }

#slideshow-wrap input[type=radio]#button-2:checked~label[for=button-2] { background-color: rgba(100,100,100,1) }

#slideshow-wrap input[type=radio]#button-3:checked~label[for=button-3] { background-color: rgba(100,100,100,1) }

#slideshow-wrap input[type=radio]#button-4:checked~label[for=button-4] { background-color: rgba(100,100,100,1) }

#slideshow-wrap input[type=radio]#button-5:checked~label[for=button-5] { background-color: rgba(100,100,100,1) }

#slideshow-wrap label[for=button-1] { margin-left: -36px }

#slideshow-wrap label[for=button-2] { margin-left: -18px }

#slideshow-wrap label[for=button-4] { margin-left: 18px }

#slideshow-wrap label[for=button-5] { margin-left: 36px }

#slideshow-wrap input[type=radio]#button-1:checked~#slideshow-inner>ul { left: 0 }

#slideshow-wrap input[type=radio]#button-2:checked~#slideshow-inner>ul { left: -100% }

#slideshow-wrap input[type=radio]#button-3:checked~#slideshow-inner>ul { left: -200% }

#slideshow-wrap input[type=radio]#button-4:checked~#slideshow-inner>ul { left: -300% }

#slideshow-wrap input[type=radio]#button-5:checked~#slideshow-inner>ul { left: -400% }