So go to:
Blogger=====>Layout=========>add a gadget======>choose HTML/JAVA SCRIPT and add this code right here :
(Remark: you can change the color of those search boxes using this site that gives you all hex color codes so enjoy it : http://hex-color.com)
<style>
#search-box {
position: relative;
width: 100%;
margin: 0;
}
#search-form
{
height: 40px;
border: 1px solid #999;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
background-color: #fff;
overflow: hidden;
}
#search-text
{
font-size: 14px;
color: #ddd;
border-width: 0;
background: transparent;
}
#search-box input[type="text"]
{
width: 90%;
padding: 11px 0 12px 1em;
color: #333;
outline: none;
}
#search-button {
position: absolute;
top: 0;
right: 0;
height: 42px;
width: 80px;
font-size: 14px;
color: #fff;
text-align: center;
line-height: 42px;
border-width: 0;
background-color: #4d90fe;
-webkit-border-radius: 0px 5px 5px 0px;
-moz-border-radius: 0px 5px 5px 0px;
border-radius: 0px 5px 5px 0px;
cursor: pointer;
}
</style>
<div id='search-box'>
<form action='/search' id='search-form' method='get' target='_top'>
<input id='search-text' name='q' placeholder='Search TechFrost' type='text'/>
<button id='search-button' type='submit'><span>Search</span></button>
</form>
</div>