app.css

.events {
	position: relative;
	display: flex;
	width: 100vh;
	margin: 0 auto;
}
.events .years {
	display: inline-block;
	top: 0;
	color: green;
}
.events .years .year {
	display: none;
}
.events .years .year.active {
	color: rgba(82, 221, 168, 0.185);
	display: block;
}
.events .months {
	display: inline-block;
	top: 0;
	color: yellow;
}
.events .months .event {
	color: pink;
}
.select-hidden {
	display: none;
	visibility: hidden;
	padding-right: 10px;
}
.select {
	cursor: pointer;
	display: inline-block;
	position: relative;
	font-size: 16px;
	width: 120px;
	height: 50px;
	margin: 0 10px;
	text-indent: 5px;
	border: 5px;
}
.select-styled {
	position: absolute;
	top: 10px;
	right: 0;
	bottom: 0;
	left: 0;
	background-color: rgba(82, 221, 168, 0.185);
	padding: 8px 15px;
	border-radius: 5px;
}
.select-styled:after {
	content: '';
	width: 0;
	height: 0;
	border: 7px solid transparent;
	border-color: rgba(115, 37, 218, 0.747) transparent transparent transparent;
	position: absolute;
	top: 16px;
	right: 10px;
	cursor: pointer;
	-webkit-transition: 0.25s all ease;
	-o-transition: 0.25s all ease;
	transition: 0.25s all ease;
}
.select-styled:hover {
	background-color: rgb(61, 233, 190);
}
.select-styled:active,
.select-styled.active {
	background-color: rgb(179, 211, 35);
}
.select-styled:active:after,
.select-styled.active:after {
	top: 9px;
	border-color: transparent transparent rgb(61, 233, 190) transparent;
}
.select-options {
	display: none;
	position: absolute;
	top: 100%;
	right: 0;
	left: 0;
	z-index: 999;
	margin: 0;
	padding: 0;
	background-color: rgb(154, 192, 184);
}
.select-options li {
	margin: 0;
	padding: 12px 0;
	text-indent: 15px;
	list-style: none;
	border-top: 1px solid rgb(30, 255, 0);
}
.select-options li:hover {
	color: rgb(255, 255, 255);
	background: rgb(0, 0, 0);
}
.select-options li[rel='hide'] {
	display: none;
}