我需要我的滑块固定在页面顶部

Question

我需要将我的滑块固定在页面顶部，我的内容（文本）位于其下方，但由于某种原因，我的文字和内容在滚动条后方滚动，文字/内容渐渐淡入淡出下面是HTML代码

<style type="text/css">.cb-slideshow,
.cb-slideshow:after { 
    position: fixed;
    width: 100%;
    height: 85%;
    top: 0px;
    left: 0px;  
    z-index: 0; 
}
.cb-slideshow:after { 
    content: '';
    background: transparent url(../images/pattern.png) repeat top left; 
}
.cb-slideshow li span { 
    width: 100%;
    height: 85%;
    position: absolute;
    top: 0px;
    left: 0px;
    color: transparent;
    background-size: center top;
    background-position: 50% 50%;
    background-repeat: none;
    opacity: 0;
    z-index: 0;
    animation: imageAnimation 36s linear infinite 0s; 
}
.cb-slideshow li div { 
    z-index: 1000;
    position: absolute;
    bottom: 30px;
    left: 0px;
    width: 100%;
    text-align: center;
    opacity: 0;
    color: #fff;
    animation: titleAnimation 36s linear infinite 0s; 
}
.cb-slideshow li div h3 { 
    font-family: 'BebasNeueRegular', 'Arial Narrow', Arial, sans-serif;
    font-size: 240px;
    padding: 0;
    line-height: 200px; 
}
.cb-slideshow li:nth-child(1) span { 
    background-image: url(/ckfinder/userfiles/7699/images/1.jpg) 
}
.cb-slideshow li:nth-child(2) span { 
    background-image: url(/ckfinder/userfiles/7699/images/4.jpg);
    animation-delay: 6s; 
}
.cb-slideshow li:nth-child(3) span { 
    background-image: url(/ckfinder/userfiles/7699/images/7.jpg);
    animation-delay: 12s; 
}
.cb-slideshow li:nth-child(4) span { 
    background-image: url(/ckfinder/userfiles/7699/images/12.jpg);
    animation-delay: 18s; 
}
.cb-slideshow li:nth-child(5) span { 
    background-image: url(/ckfinder/userfiles/7699/images/14.jpg);
    animation-delay: 24s; 
}
.cb-slideshow li:nth-child(6) span { 
    background-image: url(/ckfinder/userfiles/7699/images/26.jpg);
    animation-delay: 30s; 
}

.cb-slideshow li:nth-child(2) div { 
    animation-delay: 6s; 
}
.cb-slideshow li:nth-child(3) div { 
    animation-delay: 12s; 
}
.cb-slideshow li:nth-child(4) div { 
    animation-delay: 18s; 
}
.cb-slideshow li:nth-child(5) div { 
    animation-delay: 24s; 
}
.cb-slideshow li:nth-child(6) div { 
    animation-delay: 30s; 
}
@keyframes imageAnimation { 
    0% { opacity: 0; animation-timing-function: ease-in; }
    8% { opacity: 1; animation-timing-function: ease-out; }
    17% { opacity: 1 }
    25% { opacity: 0 }
    100% { opacity: 0 }
}
.no-cssanimations .cb-slideshow li span{
    opacity: 1;
}
@media screen and (max-width: 1140px) { 
    .cb-slideshow li div h3 { font-size: 140px }
}
@media screen and (max-width: 600px) { 
    .cb-slideshow li div h3 { font-size: 80px }
}
@keyframes imageAnimation { 
    0% {
        opacity: 0;
        animation-timing-function: ease-in;
    }
    8% {
        opacity: 1;
        transform: scale(1.05);
        animation-timing-function: ease-out;
    }
    17% {
        opacity: 1;
        transform: scale(1.1) rotate(3deg);
    }
    25% {
        opacity: 0;
        transform: scale(1.1) rotate(3deg);
    }
    100% { opacity: 0 }
}
</head>
</style>
<ul class="cb-slideshow">
    <li><span>Image 01</span></li>
    <li><span>Image 02</span></li>
    <li><span>Image 03</span></li>
    <li><span>Image 04</span></li>
    <li><span>Image 05</span></li>
    <li><span>Image 06</span></li>
</ul>