2.Scroll down to where you see </head> tag .
3.Copy below code and paste it just before the </head> tag .
<style type='text/css'>
#search {
height:34px;
width:auto;
margin-top:10px;
padding:17px 5px 10px 15px;
width:311px;
background:url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg06t-9C9zDZhJI_O4kjygG5zV61hnqzR05HW_xAZL4N1w_IRFiayi5AcEN7R-84EK9xBku35u52n4Vz7IxcLkdAIZ8q08kr-1Uqg4jt0as0Wq1aRLHNPWmarlGPN19Dp9cpOsXCl1-Y-Yy/);
}
#search form {
margin: 0;
padding: 0;
}
#search fieldset {
margin: 0;
padding: 0;
border: none;
}
#search p {
margin: 0;
font-size: 85%;
}
#s {
margin-left:0px;
float: left;
width:231px;
padding: 6px 2px 6px 5px;
background:#fff url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKIh28ellN8dJb_G8i8DGVImRH7GBv3_XVoPOxiVQcrUIyCJycw5wfcDDGHiiicxlB5hdm97Qi8Odq78CTPiJyk1IJPqNimv7op_B0WMvd-Om8tY9DxonYSfvFmYSV4FmEqUoW178DKkWH/s1600/sform.png) no-repeat;
border:none;
font: normal 100% "Tahoma", Arial, Helvetica, sans-serif;
color:#C6C6C6;
}
#searchsubmit {
width:57px;
float: left;
background:#fff url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsjiyCXF9FNyYrpyUnblc17gIFtgt_Brq4W4OfLATVZSaKzpmlM1xt2uTBvZpIpMqVPtlK4Gptq7gM0tudf-4zC2MJg0VAD0de5Jl1LpIvBMGqgXCwQkyH5c-BUcBg9dlz2Y_xZhrxxz9Z/);
border:none;
font: bold 100% "century gothic", Arial, Helvetica, sans-serif;
color: #FFFFFF;
height:28px;
margin-left:5px;
}
</style>
Note:Please host above 3 images yourself.
4.Now save your template.
5.Go to Layout-->Page Elements and click on "Add a gadget".
6.Select "html/java script" and add the code given below and click save.
<div id='search'>
<form id="searchform" action="http://YOURBLOG.blogspot.com/search" style="display:inline;" method="get">
<input id="s" name="q" type="text" value=""/>
<input id="searchsubmit" value="" type="submit"/>
</form>
</div>
Note: Remember to replace "YOURBLOG" with your blog name.
You are done.It will look like this:

Smart CSS Search Box to Blog/Website







