*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    outline: none;
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
    color: #707070;
    background-color: #333;
}

.container {
    margin: 0 auto;
    max-width: 750px;
    max-height: 100vh;
    background-color: white;
}


/* Useful Classes */
.xy-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.transition {
    transition: all 350ms ease-in-out;
}

.r-3-2 {
    width: 100%;
    padding-bottom: 66.667%;
    background-color: #ddd;
}

.image-holder {
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
}

/* Main Styles */
.gallery-wrapper {
    position: relative;
    overflow: hidden;
}

.gallery {
    position: relative;
    white-space: nowrap;
    font-size: 0;
}

.item-wrapper {
    cursor: pointer;
    width: 23%;
    /* arbitrary value */
    display: inline-block;
    background-color: white;
}

.gallery-item {
    opacity: 0.5;
}

.gallery-item.active {
    opacity: 1;
}

.controls {
    font-size: 0;
    border-top: none;
}

.move-btn {
    display: inline-block;
    width: 50%;
    border: none;
    color: #ccc;
    background-color: transparent;
    padding: 0.2em 1.5em;
}

.move-btn:first-child {
    border-right: none;
}

.move-btn.left {
    cursor: w-resize;
}

.move-btn.right {
    cursor: e-resize;
}

h1 {
    padding-top: 10px;
    text-align: center;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    font-weight: 100;
    font-size: 5vh;
    color: white;
}

h2 {
    padding: 10px;
    text-align: center;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
    font-weight: 50;
    font-size: 2vh;
    color: white;
}