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HTML

              
                <nav class="tab" data-selected="2">
	<div class="icons">
		<div data-index="1" class="icon fad fa-home"></div>
		<div data-index="2" class="icon fal fa-plus"></div>
		<div data-index="3" class="icon fad fa-user fa-swap-opacity"></div>
	</div>
	<div class="bar">
		<div class="cap"></div>
		<div class="middle">
			<div class="side"></div>
			<div class="circle"></div>
			<div class="side"></div>
		</div>
		<div class="cap"></div>
	</div>
</nav>
              
            
!

CSS

              
                $transition:.75s;
body {
	display:flex;
	justify-content:center;
	align-items:center;
	background:#E6E9ED;
	//background-image: linear-gradient(-45deg, #8067B7, #EC87C0);
		//That circle gap is a real gap, uncomment above
	min-height:100vh;
	nav.tab {
		position: relative;
		display:flex;
		align-items:stretch;
		width:23rem;
		height:4rem;
		&.moving .icon {
			pointer-events:none;
		}
      &[data-selected="1"] .icon:nth-child(1),
		&[data-selected="2"] .icon:nth-child(2),
		&[data-selected="3"] .icon:nth-child(3) {
			top:-1.5rem;
			color:#2ABA66;
			font-size:2rem;
			transition:.25s $transition/2;
			pointer-events:none;
			&.initialised {
				animation: hide $transition*1.2 forwards;
			}
      }
		&[data-selected="1"] .bar .middle .side:first-child,
		&[data-selected="3"] .bar .middle .side:last-child{
			flex-grow:0;
				//Sliding works with 2 `flex-grow:1` elements either side of the circle
				//To animate set the one you want to go to 0
		}
		.icons {
			position: absolute;
			z-index:2;
			display:flex;
			justify-content:space-around;
			width:calc(100% - 2rem);
			padding:0 1rem;
			.icon {
				position: relative;
				top:0rem;
				width:4rem;
				line-height:4rem;
				font-size:1.5rem;
				text-align:center;
				cursor: pointer;
				transition-delay:$transition/4;
				&.initialised { //So animations don't start on load, .icon gets .initialised after it is clicked
					animation: hide2 $transition/2;
				}
			}
		}
		.bar {
			z-index:1;
			position: absolute;
			display:flex;
			align-items:stretch;
			filter: drop-shadow(0 0 0.5rem rgba(0,0,0,0.1)) drop-shadow(0 0 0.25rem rgba(0,0,0,0.1)); 
				//^ Otherwise everything is pointless, everything has lead up to this shadow
			width:100%;
			height:100%;
			.cap {
				background:white;
				width:1rem;
				&:first-child {
					border-bottom-left-radius:1rem;
					border-top-left-radius:0.5rem;
					box-shadow:0.25rem 0 0 white; 
						//^ Sometimes when the circle moves small gaps <1px form on the sides, this makes an overlap to hide it
				}
				&:last-child {
					border-bottom-right-radius:1rem;
					border-top-right-radius:0.5rem;
					box-shadow:-0.25rem 0 0 white;
				}
			}
			.middle {
				flex-grow:1;
				position: relative;
				display:flex;
				.circle {
					position: relative;
					top:-1.75rem;
					width:7rem;
					height:5.75rem;
					background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='112' height='92' viewBox='0 0 112 92'%3E%3Ccircle cx='56' cy='36' r='36' fill='%23FFF'/%3E%3Cpath d='M104 35.2L104 35.2c0 26.3-20.9 48.3-47.2 48.8C29.9 84.4 8 62.8 8 36v-0.8c0-4-3.2-7.2-7.2-7.2H0v64h112V28h-0.8C107.2 28 104 31.2 104 35.2z' fill='%23FFF'/%3E%3C/svg%3E");
						//^ Cheating, or being smart?
				}
				.side {
					flex-grow:1;
					background:white;
					transition:$transition ease;
				}
			}
		}
	}
}
@keyframes hide {
	0%, 100% {
		opacity:1;
	}
	25%, 75% {
		opacity:0;
	}
}
@keyframes hide2 {
	0%, 100% {
		opacity:1;
	}
	15% /*This is the difference*/, 75% {
		opacity:0;
	}
}
              
            
!

JS

              
                let previous = -1;
$(".icon[data-index]").click(function(){
	$(this).addClass("initialised");
	let index = $(this).attr("data-index");
	let navtab = $(this).closest("nav.tab").addClass("moving").attr("data-selected", index);
	if(previous == -1) navtab.find('.icon[data-index="2"]').addClass("initialised")
	if(previous == 1 && index == 3 || previous == 3 && index == 1) { //If going from one side to the other and middle needs to be hidden
		navtab.find('.icon[data-index="2"]').removeClass("initialised");
		setTimeout(function(){ //Because apparently this is the only way it will work
			navtab.find('.icon[data-index="2"]').addClass("initialised"); //Same animation as the other so they line up
		});
	}
	previous = index;
	setTimeout(function(){
		navtab.removeClass("moving").removeClass("hidemiddle");
	}, 750);
}); 
/*🤢 If someone knows how to sort out the animations in a non-garbage way please fork and mention in a comment, I kinda got stuck.*/
              
            
!
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