* {
    padding: 0;
    margin: 0
}

:root {
    --thumbnail-width: 20px;
    --thumbnail-height: 3px;
    --shadow: rgba(0, 0, 0, .25)
}




#sections-wrapper {
    position: relative;
    overflow: hidden;
    height: 100vh;
    
}

section {
    height: 100vh;
    font-size: 0;
    text-align: center;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0
}

.hide-bottom {
    transform: translateY(100%)
}

.hide-top {
    transform: translateY(-100%)
}

.segment {
    height: 100%;
    display: inline-block;
    overflow: hidden;
    position: relative;
    box-sizing: border-box
}

.segment-inner {
    position: absolute;
    top: 0;
    background: no-repeat center center/cover;
    height: 100%;
    width: 100vw
}

.sections-control {
    text-align: center;
    font-size: 0;
    position: fixed;
    right: 25px;
    bottom: 25px;
    box-sizing: border-box
}

.section-thumbnail {
    width: var(--thumbnail-width);
    height: var(--thumbnail-height);
    display: block;
    margin-top: 4px;
    padding: 4px 0;
    position: relative;
    transition: .3s all ease;
    opacity: .5;
    cursor: pointer;
    transform-origin: right top
}

.section-thumbnail:before {
    content: "";
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: var(--thumbnail-height);
    top: 50%;
    margin-top: calc(var(--thumbnail-height)/2 * -1);
    background: #fff
}

.section-thumbnail:hover {
    opacity: 1
}

.section-thumbnail.active {
    transform: scaleX(2);
    opacity: 1
}