main.css

body, html {
	width: 100%;
	height: 100vh;
	display: flex;
	justify-content: center;
	align-items: center;
	font-family: Poppins;
	flex-direction: column;
}
li{
	display: flex;
	align-items: center;
	justify-content: center;
}
li:hover{
	font-size: 13px;
}
.soundboard {
	width: auto;
	height: auto;
	background-color: blue;
	padding: 10px;
	border-radius: 20px;
}
.button-row {
	width: auto;
	height: auto;
	display: flex;
	justify-content: center;
	align-items: center;
	flex-direction: row;
	list-style: none;
	margin: 0;
	padding: 0;
}
.button {
	width: 100px;
	height: 100px;
	background-color: #eee;
	margin: 10px;
	margin-bottom: 25px;
	border-radius: 10px;
	box-shadow: 0px 15px 0px 0px #ddd;
	box-sizing: border-box;
}
.button:hover {
	border: inset 7px red;
	cursor: pointer;
	transition: .3s;
}
.button:active {
	background-color: green;
	border: 0;
	box-shadow: none;
	transition: .35s;
}
h1{
	display: flex;
	justify-content: center;
	align-items: center;
}
.volume{
	padding: 20px;
}
.slider {
    -webkit-appearance: none;
    width: 1000px;
    height: 15px;
    border-radius: 5px;
    background: #d3d3d3;
    outline: none;
    -webkit-transition: .2s;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background: blue;
    cursor: pointer;
}
.slider-label{
	width: 100%;
	height: auto;
	display: flex;
	justify-content: space-between;
	align-items: center;
}
#board{
	display: flex;
	position: absolute;
	align-items: center;
	justify-content: center;
	opacity: 0.99;
	top: 3%;
	left: 25%;
}
#particles-js{
	height: 100%;
	width: 100%;
}