section.vertical-slider {
    background-color: #ccc;
    background-attachment: fixed;
    height: auto;
    overflow: hidden;
    background-position: 50% 50%;
    position: relative;
}

section.vertical-slider ul.slides {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

section.vertical-slider ul.slides > li {
    width: 100%;
    height: 100%;
    margin: 0 auto;
    padding: 0;
    position: relative;

    background-size: cover;
    /*background-attachment: fixed;*/
    background-position: center;
}

section.vertical-slider ul.left-nav {
    position: absolute;
    top: 50%;
    top: 50vh;
    left: 0;
    list-style-type: none;
    margin: 0 0 0 10px;
    padding: 0;

    -webkit-transform: translateY(-50%);
    transform: translateY(-50%);

    margin: 0;
}

section.vertical-slider ul.left-nav li {
    display: block;
    width: 18px;
    height: 18px;
    margin: 10px 5px;
    padding: 0;
}

section.vertical-slider ul.left-nav li a {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: transparent;
    border: solid white 2px;

    outline: none;

    box-shadow: 0 0 5px rgba(0,0,0,0.2);
    box-shadow: 0 0 5px rgba(0,0,0,0.2), inset 0 0 5px rgba(0,0,0,0.2);
}

section.vertical-slider ul.left-nav.dark-theme li a { border: solid #666 2px; box-shadow: 0 0 5px rgba(255,255,255,0.2), inset 0 0 5px rgba(255,255,255,0.2); }

section.vertical-slider ul.left-nav li.active a, ul.left-nav li a:hover  { background-color: white; box-shadow: 0 0 5px rgba(0,0,0,0.2); }
section.vertical-slider ul.left-nav.dark-theme li.active a, ul.left-nav.dark-theme li a:hover  { background-color: #666; box-shadow: 0 0 5px rgba(255,255,255,0.2); }
section.vertical-slider ul.left-nav li.active a { cursor: default; pointer-events: none; }

section.vertical-slider ul.left-nav {
    left: 15px;
    top: 50vh;
}

section.vertical-slider ul.left-nav.floating {
    position: fixed;
}

section.vertical-slider ul.left-nav.bottom {
    position: absolute;
    top: auto;
    bottom: 50vh;

    -webkit-transform: translateY(50%);
    transform: translateY(50%);
}