<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name='viewport' content='width=device-width,initial-scale=1.0,user-scalable=no' />
<style type='text/css'>
body{
margin: 0;
padding: 0;
background: #e84118;
}
.search-box{
position: absolute;
top:50%;
left:50%;
transform: translate(-50%,-50%);
background: #2f3640;
height: 40px;
border-radius: 40px;
padding: 10px;
}
.search-box:hover>.search-txt{
width: 240px;
/*padding: 0 6px;*/
}
.search-box:hover{
width:280px;
}
.search-box:hover>.search-btn{
background: white;
}
.search-btn{
color: #e84118;
float:left;
width: 40px;
height: 40px;
border-radius: 50%;
background: #2f3640;
display: flex;
justify-content: center;
align-items: center;
}
.search-txt{
border: none;
background: none;
outline: none;
float: left;
padding: 0;
color: white;
font-size: 16px;
transition:1s;
line-height: 40px;
width: 0px;
}
</style>
<script defer src="https://use.fontawesome.com/releases/v5.0.6/js/all.js"></script>
<title>Awesome Search Box</title>
</head>
<body>
<div class="search-box">
<input class="search-txt" type="text" name="" placeholder="Type to search">
<a class="search-btn" href="#">
<i class="fas fa-search"></i>
</a>
</div>
</body>
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