body, html {
	font-size: 100%;
	font-size: 16px;
	padding: 0;
	margin: 0;
	height: 100%;
}

h1 {
    text-align: center;
}
article {
    margin: 50px 0;
    padding: 0 20%;
}
article img {
    display: block;
    width: 84%;
    height: auto;
    margin: 100px auto 50px;
    transition: transform 0.5s ease;
}
article img.zoom-in {
    transform: scale(1.2);
}

/* TIMELINE */
.timeline {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 6px;
    background-color: #f1f1f1;
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -3px;
    z-index: -1;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 40%;
}

.timeline-item.left::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 25px;
    right: -16px;
    background-color: #ff9f55;
    border: 4px solid #ff9f55;
    top: 15px;
    border-radius: 50%;
    z-index: 1;
}
.timeline-item.right::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 25px;
    left: -16px;
    background-color: #ff9f55;
    border: 4px solid #ff9f55;
    top: 15px;
    border-radius: 50%;
    z-index: 1;
}
.left {
    left: 40px;
}

.right {
    left: 50%;
}

.left::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 22px;
    width: 0;
    z-index: 1;
    right: 30px;
    border: medium solid #ccc;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent #ccc;
}

.right::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 22px;
    width: 0;
    z-index: 1;
    left: 30px;
    border: medium solid #ccc;
    border-width: 10px 10px 10px 0;
    border-color: transparent #ccc transparent transparent;
}
.content {
    padding: 20px 30px;
    background-color: white;
    position: relative;
    border: 1px solid #ccc;
    border-radius: 6px;
}

.timeline-item.hidden {
    opacity: 0;
    transform: translateY(100px);
    transition: all 0.5s ease-out;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}