Резиновое слайдшоу с эффектом параллакса на CSS3

<div class="sp-slideshow">
 
    <input id="button-1" type="radio" name="radio-set" class="sp-selector-1" checked="checked" />
    <label for="button-1" class="button-label-1"></label>
 
    <input id="button-2" type="radio" name="radio-set" class="sp-selector-2" />
    <label for="button-2" class="button-label-2"></label>
 
    <input id="button-3" type="radio" name="radio-set" class="sp-selector-3" />
    <label for="button-3" class="button-label-3"></label>
 
    <input id="button-4" type="radio" name="radio-set" class="sp-selector-4" />
    <label for="button-4" class="button-label-4"></label>
 
    <input id="button-5" type="radio" name="radio-set" class="sp-selector-5" />
    <label for="button-5" class="button-label-5"></label>
 
    <label for="button-1" class="sp-arrow sp-a1"></label>
    <label for="button-2" class="sp-arrow sp-a2"></label>
    <label for="button-3" class="sp-arrow sp-a3"></label>
    <label for="button-4" class="sp-arrow sp-a4"></label>
    <label for="button-5" class="sp-arrow sp-a5"></label>
 
    <div class="sp-content">
        <div class="sp-parallax-bg"></div>
        <ul class="sp-slider clearfix">
            <li><img src="/images/image1.png" alt="image01" /></li>
            <li><img src="/images/image2.png" alt="image02" /></li>
            <li><img src="/images/image3.png" alt="image03" /></li>
            <li><img src="/images/image4.png" alt="image04" /></li>
            <li><img src="/images/image5.png" alt="image05" /></li>
        </ul>
    </div><!-- sp-content -->
 
</div><!-- sp-slideshow -->

.sp-slideshow {
    position: relative;
    margin: 10px auto;
    width: 80%;
    max-width: 1000px;
    min-width: 260px;
    height: 460px;
    border: 10px solid #fff;
    border: 10px solid rgba(255,255,255,0.9);
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}
 
.sp-content {
    background: #7d7f72 url(../images/grid.png) repeat scroll 0 0;
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}
 
.sp-parallax-bg {
    background: url(../images/map.png) repeat-x scroll 0 0;
    background-size: cover;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.sp-slideshow input {
    position: absolute;
    bottom: 15px;
    left: 50%;
    width: 9px;
    height: 9px;
    z-index: 1001;
    cursor: pointer;
    opacity: 0;
}
 
.sp-slideshow input + label {
    position: absolute;
    bottom: 15px;
    left: 50%;
    width: 6px;
    height: 6px;
    display: block;
    z-index: 1000;
    border: 3px solid #fff;
    border: 3px solid rgba(255,255,255,0.9);
    border-radius: 50%;
    transition: background-color linear 0.1s;
}
.sp-slideshow input:checked + label {
    background-color: #fff;
    background-color: rgba(255,255,255,0.9);
}
 
.sp-selector-1, .button-label-1 {
    margin-left: -36px;
}
 
.sp-selector-2, .button-label-2 {
    margin-left: -18px;
}
 
.sp-selector-4, .button-label-4 {
    margin-left: 18px;
}
 
.sp-selector-5, .button-label-5 {
    margin-left: 36px;
}

.sp-arrow {
    position: absolute;
    top: 50%;
    width: 28px;
    height: 38px;
    margin-top: -19px;
    display: none;
    opacity: 0.8;
    cursor: pointer;
    z-index: 1000;
    background: transparent url(../images/arrows.png) no-repeat;
    transition: opacity linear 0.3s;
}
.sp-arrow:hover{
    opacity: 1;
}
.sp-arrow:active{
    margin-top: -18px;
}

.sp-selector-1:checked ~ .sp-arrow.sp-a2,
.sp-selector-2:checked ~ .sp-arrow.sp-a3,
.sp-selector-3:checked ~ .sp-arrow.sp-a4,
.sp-selector-4:checked ~ .sp-arrow.sp-a5 {
    right: 15px;
    display: block;
    background-position: top right;
}
.sp-selector-2:checked ~ .sp-arrow.sp-a1,
.sp-selector-3:checked ~ .sp-arrow.sp-a2,
.sp-selector-4:checked ~ .sp-arrow.sp-a3,
.sp-selector-5:checked ~ .sp-arrow.sp-a4 {
    left: 15px;
    display: block;
    background-position: top left;
}

.sp-slideshow input:checked ~ .sp-content {
    transition: background-position linear 0.6s, background-color linear 0.8s;
}

.sp-slideshow input:checked ~ .sp-content .sp-parallax-bg {
    transition: background-position linear 0.7s;
}

input.sp-selector-1:checked ~ .sp-content {
    background-position: 0 0;
    background-color: #727b7f;
}
 
input.sp-selector-2:checked ~ .sp-content {
    background-position: -100px 0;
    background-color: #7f7276;
}
 
input.sp-selector-3:checked ~ .sp-content {
    background-position: -200px 0;
    background-color: #737f72;
}
 
input.sp-selector-4:checked ~ .sp-content {
    background-position: -300px 0;
    background-color: #79727f;
}
 
input.sp-selector-5:checked ~ .sp-content {
    background-position: -400px 0;
    background-color: #7d7f72;
}

input.sp-selector-1:checked ~ .sp-content .sp-parallax-bg {
    background-position: 0 0;
}
 
input.sp-selector-2:checked ~ .sp-content .sp-parallax-bg {
    background-position: -200px 0;
}
 
input.sp-selector-3:checked ~ .sp-content .sp-parallax-bg {
    background-position: -400px 0;
}
 
input.sp-selector-4:checked ~ .sp-content .sp-parallax-bg {
    background-position: -600px 0;
}
 
input.sp-selector-5:checked ~ .sp-content .sp-parallax-bg {
    background-position: -800px 0;
}

.sp-slider {
    position: relative;
    left: 0;
    width: 500%;
    height: 100%;
    list-style: none;
    margin: 0;
    padding: 0;
    transition: left ease-in 0.8s;
}

.sp-slider > li {
    color: #fff;
    width: 20%;
    box-sizing: border-box;
    height: 100%;
    padding: 0 60px;
    float: left;
    text-align: center;
    opacity: 0.4;
    transition: opacity ease-in 0.4s 0.8s;
}
.sp-slider > li img{
    box-sizing: border-box;
    display: block;
    margin: 0 auto;
    padding: 40px 0 50px 0;
    max-height: 100%;
    max-width: 100%;
}

input.sp-selector-1:checked ~ .sp-content .sp-slider {
    left: 0;
}
 
input.sp-selector-2:checked ~ .sp-content .sp-slider {
    left: -100%;
}
 
input.sp-selector-3:checked ~ .sp-content .sp-slider {
    left: -200%;
}
 
input.sp-selector-4:checked ~ .sp-content .sp-slider {
    left: -300%;
}
 
input.sp-selector-5:checked ~ .sp-content .sp-slider {
    left: -400%;
}

input.sp-selector-1:checked ~ .sp-content .sp-slider > li:first-child,
input.sp-selector-2:checked ~ .sp-content .sp-slider > li:nth-child(2),
input.sp-selector-3:checked ~ .sp-content .sp-slider > li:nth-child(3),
input.sp-selector-4:checked ~ .sp-content .sp-slider > li:nth-child(4),
input.sp-selector-5:checked ~ .sp-content .sp-slider > li:nth-child(5){
    opacity: 1;
}