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HTML 

              
                <div style="display: flex; flex-direction: column; width: 100vw; height: 100vh; align-items: center; justify-content: center">
	<h1>Navigation Bottom Tabs Bar - nuemorphism style - soft UI</h1>
	<h2>this bottom tabs bar was designed and developed to serve its purpose of usage for bloigencyبلوغجنسي </h2>
	<p>click on each button to witness the flow. the bar is invisible on large and medium screens (bootstrap 4 standard for media breakpoints) <br> please click search button to active . and click again to switch to input.</p>
</div>
<div class="tab-bar">
	<ul>
		<li class="active"><i class="fas fa-newspaper"></i><span>bloigency</span></li>
		<li><i class="fas fa-file-alt"></i><span>Articles</span></li>
		<li><i class="fas fa-tag"></i><span>Tags</span></li>
		<li class="search"><i class="fas fa-search"></i><span>Search</span></li>
	</ul>
</div>
!

CSS 

              
                body{ 
	min-height: 100vh; 
	min-width: 100vw; 
	background-color: #FFF7FC;
	color: #2e1227;
	max-height: 100vh; 
	max-width: 100vw;
	height: 100vh; 
	width: 100vw;
	box-sizing: border-box;
	padding: 0;
	margin: 0;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	font-family: 'Tajawal', sans-serif;
	font-weight: 400;
}
h1{
	font-weight: 900;
	color: black;
}
h2{
	font-weight: 400;
}
hr{
	margin-top: 1rem;
	margin-bottom: 1rem;
	border-top: 1.6px solid white !important;
	border-bottom: 1.6px solid #2e122734!important;
	box-shadow: 0px -6px 16px #2e122734, 0px 6px 10px #fff;
}



.tab-bar{
	display: flex;
	position: fixed;
	height: 56px;
	min-width: 100vw;
	align-items: center;
	bottom: 0;
	box-shadow: 0px -2px 3px #2e122734;
/* 	background */
	background: rgba(247,239,244,1);
background: -moz-linear-gradient(top, rgba(247,239,244,1) 0%, rgba(247,239,244,1) 7%, rgba(255,255,255,1) 34%, rgba(247,239,244,1) 77%, rgba(247,239,244,1) 100%);
background: -webkit-gradient(left top, left bottom, color-stop(0%, rgba(247,239,244,1)), color-stop(7%, rgba(247,239,244,1)), color-stop(34%, rgba(255,255,255,1)), color-stop(77%, rgba(247,239,244,1)), color-stop(100%, rgba(247,239,244,1)));
background: -webkit-linear-gradient(top, rgba(247,239,244,1) 0%, rgba(247,239,244,1) 7%, rgba(255,255,255,1) 34%, rgba(247,239,244,1) 77%, rgba(247,239,244,1) 100%);
background: -o-linear-gradient(top, rgba(247,239,244,1) 0%, rgba(247,239,244,1) 7%, rgba(255,255,255,1) 34%, rgba(247,239,244,1) 77%, rgba(247,239,244,1) 100%);
background: -ms-linear-gradient(top, rgba(247,239,244,1) 0%, rgba(247,239,244,1) 7%, rgba(255,255,255,1) 34%, rgba(247,239,244,1) 77%, rgba(247,239,244,1) 100%);
background: linear-gradient(to bottom, rgba(247,239,244,1) 0%, rgba(247,239,244,1) 7%, rgba(255,255,255,1) 34%, rgba(247,239,244,1) 77%, rgba(247,239,244,1) 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f7eff4', endColorstr='#f7eff4', GradientType=0 );
}
.tab-bar ul{
	display: flex;
	flex-direction: row;
	list-style: none;
	padding: 0;
	margin: 0 auto;
	min-width: 95vw;
	align-items: center;
	justify-content: space-around;
	align-self: center;
	height: 100%;
}
.tab-bar ul li{
	background-color: rgb(247, 239, 244);
	height: 43px;
	width: 43px;
	display: flex;
	align-items: center;
	box-sizing: border-box;
	padding: 0.5rem;
	flex-direction: row;
	justify-content: center;
	text-decoration: none;
	border-radius: 24px;
	transition: 1s;
	filter: drop-shadow(3.4px 3.4px 2px rgb(183, 177, 181)) drop-shadow(-3.4px -3.4px 3.4px white);
	-webkit-filter: drop-shadow(3.4px 3.4px 2px rgb(183, 177, 181)) drop-shadow(-3.4px -3.4px 3.4px white);
	box-shadow: inset 4.3px 4.3px 4px #fff;
}
.tab-bar ul li i{
	font-size: 16px; 
	margin: 0 0.5rem; 
	color: transparent;
	background-color: #2e1227cc;
  text-shadow: 2px 2px 4px #f7eff4aa;
  -webkit-background-clip: text;
     -moz-background-clip: text;
          background-clip: text;
	transition: 0.25s;
	transition-delay: 0.6s;
}
.tab-bar ul li span{
	display: none; 
	opacity: 0;
	color: #9900ff00;
	font-weight: 900;
	transition-delay: 1.8s;
	transition: 0.9s;
}
.tab-bar ul li.active{
	width: 43vw;
	filter: drop-shadow(0px 0px 0px rgb(183, 177, 181));
	-webkit-filter: drop-shadow(0px 0px 0px rgb(183, 177, 181));
	box-shadow: inset 4.3px 4.3px 7px rgb(183, 177, 181);
	border: 1px solid rgb(255, 255, 255);
	text-shadow: 1px 1px 1px white;
	transition: 1s;
}
.tab-bar ul li.active i{
	font-size: 24px; 
	background-color: #9900ff; 
	transition: 1s;
}
.tab-bar ul li:hover{
	border-color: #9900ff;
}
.tab-bar ul li.active span{
	display: flex; 
	opacity: 1;
	color: #9900ffff;
}
#tab_bar_search input{
	height: 43px;
	width: 43vw;
	border-radius: 24px;
	border: unset;
	filter: drop-shadow(0px 0px 0px rgb(183, 177, 181));
	-webkit-filter: drop-shadow(0px 0px 0px rgb(183, 177, 181));
	box-shadow: inset 4.3px 4.3px 7px rgb(183, 177, 181);
	border: 1px solid rgb(255, 255, 255);
	text-shadow: 1px 1px 1px white;
	transition: 1s;
	padding: 0 16px;
}
#tab_bar_search input:focus{
	outline-width: 0;
	outline: none;
	border: 1.6px solid #9900ff;
	color: #2e1227;
}

@media only screen and (min-width: 768px){
	.tab-bar{
		display: none;
	}
}
!

JS 

              
                $(function(){
    var $tabCells = $('.tab-bar li');
		
		function change2Input($this){
			var $current_button = document.getElementById("tab_bar_search").innerHTML;

			$this.toggleClass("input");
			document.getElementById("tab_bar_search").innerHTML = '';
			document.getElementById("tab_bar_search").innerHTML = '<input type="text" placeholder="try search something">';
			$("#tab_bar_search input").focus();
			$(".search.active.input").css("padding", "0");
		}
	
    function marked() {        // define event handler
        var $this   = $(this),
						$prev		= $(".tab-bar li.active");

        if ( !($this.hasClass("active") )) {
          $prev.removeClass("active");
					$this.addClass("active");
					if($(".search").hasClass("input")){
						$(".search").removeClass("input");
						document.getElementById("tab_bar_search").innerHTML = '';
						document.getElementById("tab_bar_search").innerHTML = '<i class="fas fa-search"></i><span>Search</span>';
					} 
				} else {
					if( $this.hasClass("search") ){
						$(".tab-bar .search").attr("id", "tab_bar_search");
							change2Input($this);
					}
				}
    }

    $tabCells.click(marked);  // attach event handler
});
!
999px

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