/* remove the list style */
.main_menu{
	width:920px;
	margin:auto;
	position:relative;
	text-align:center;
}

#header_menu a:not(.menu_item){
	display:table-cell;
	height:165px;
	width:165px;
	vertical-align:middle;
	text-align:center;
	background-color:rgba(255,255,255,0.8);
	text-transform:uppercase;
	font-size:20px;
	color:#000;
	transition:all ease-in-out 0.3s;
	border-radius:20px;
}

#header_menu a:not(.menu_item):hover{
	background-color:rgba(255,255,255,1);
}

.header_bubbles{
	position:relative;
}

.header_bubbles .menu_item{
	color:#000;
	position:absolute;
	display:block;
	width:190px;
	height:190px;
}

.header_bubbles_responsive {
	display: none;
}
.header_bubbles_responsive .menu_item {
	color:#000;
}