Read Google search box codepen for more information.
HTML-
<form action="/search.html" class="search-wrapper cf">
<input type="text" placeholder="Search here..." required="">
<button type="submit">Search</button>
</form>CSS-
.cf:before, .cf:after{
content:"";
display:table;
}
.cf:after{
clear:both;
}
.cf{
zoom:1;
}
/* Form wrapper styling */
.search-wrapper {
width: 220px;
margin: 45px auto 50px auto;
box-shadow: 0 1px 1px rgba(0, 0, 0, .4) inset, 0 1px 0 rgba(255, 255, 255, .2);
}
/* Form text input */
.search-wrapper input {
width: 138px;
height: 20px;
padding: 10px 5px;
float: left;
font: bold 15px 'lucida sans', 'trebuchet MS', 'Tahoma';
border: 0;
background: #EEE;
border-radius: 3px 0 0 3px;
}
.search-wrapper input:focus {
outline: 0;
background: #fff;
box-shadow: 0 0 2px rgba(0,0,0,.8) inset;
}
.search-wrapper input::-webkit-input-placeholder {
color: #999;
font-weight: normal;
font-style: italic;
}
.search-wrapper input:-moz-placeholder {
color: #999;
font-weight: normal;
font-style: italic;
}
.search-wrapper input:-ms-input-placeholder {
color: #999;
font-weight: normal;
font-style: italic;
}
/* Form submit button */
.search-wrapper button {
overflow: visible;
position: relative;
float: right;
border: 0;
padding: 0;
cursor: pointer;
height: 40px;
width: 72px;
font: bold 15px/40px 'lucida sans', 'trebuchet MS', 'Tahoma';
color: white;
text-transform: uppercase;
background: #D83C3C;
border-radius: 0 3px 3px 0;
text-shadow: 0 -1px 0 rgba(0, 0, 0, .3);
}
.search-wrapper button:hover{
background: #e54040;
}
.search-wrapper button:active,
.search-wrapper button:focus{
background: #c42f2f;
outline: 0;
}
.search-wrapper button:before { /* left arrow */
content: '';
position: absolute;
border-width: 8px 8px 8px 0;
border-style: solid solid solid none;
border-color: transparent #d83c3c transparent;
top: 12px;
left: -6px;
}
.search-wrapper button:hover:before{
border-right-color: #e54040;
}
.search-wrapper button:focus:before,
.search-wrapper button:active:before{
border-right-color: #c42f2f;
}
.search-wrapper button::-moz-focus-inner { /* remove extra button spacing for Mozilla Firefox */
border: 0;
padding: 0;
}

Getting a Google search bar design is quite easy. Search bar codepen designs have been demonstrated. But if you need a working search and not just a UI this approach is not sufficient.

Instead of looking at a Google search bar in codepen, you can create an end to end search solution with ExpertRec where you will get a working search bar. This can also be customized to look any way you want without any coding.
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