Updated Bootstrap 5 Beta (2021)
<div class="input-group">
<input class="form-control border-end-0 border rounded-pill" type="text" value="search" id="example-search-input">
<span class="input-group-append">
<button class="btn btn-outline-secondary bg-white border-start-0 border rounded-pill ms-n3" type="button">
<i class="fa fa-search"></i>
</button>
</span>
</div>
View Demo
Original Bootstrap 4 Answer:
Consider using an input-group for your search bar.
<div class="input-group col-md-4">
<input class="form-control py-2" type="search" value="search" id="example-search-input">
<span class="input-group-append">
<button class="btn btn-outline-secondary" type="button">
<i class="fa fa-search"></i>
</button>
</span>
</div>
Additionally, you can style the search bar with border utils...
<div class="input-group col-md-4">
<input class="form-control py-2 border-right-0 border" type="search" value="search" id="example-search-input">
<span class="input-group-append">
<button class="btn btn-outline-secondary border-left-0 border" type="button">
<i class="fa fa-search"></i>
</button>
</span>
</div>
Alternatively, try using a input-group-text
without a background to place the icon inside the input field...
<div class="input-group">
<input class="form-control py-2 border-right-0 border" type="search" value="search" id="example-search-input">
<span class="input-group-append">
<div class="input-group-text bg-transparent"><i class="fa fa-search"></i></div>
</span>
</div>
For variation, consider using a grid (row
>col-
) without gutters:
<div class="row no-gutters">
<div class="col">
<input class="form-control border-secondary border-right-0 rounded-0" type="search" value="search" id="example-search-input4">
</div>
<div class="col-auto">
<button class="btn btn-outline-secondary border-left-0 rounded-0 rounded-right" type="button">
<i class="fa fa-search"></i>
</button>
</div>
</div>
Or, prepend the icon like this...
<div class="input-group">
<span class="input-group-prepend">
<div class="input-group-text bg-transparent border-right-0">
<i class="fa fa-search"></i>
</div>
</span>
<input class="form-control py-2 border-left-0 border" type="search" value="..." id="example-search-input" />
<span class="input-group-append">
<button class="btn btn-outline-secondary border-left-0 border" type="button">
Search
</button>
</span>
</div>
View Demo of all Bootstrap 4 icon input options
https://i.sstatic.net/rxtxd.png
See an Example with validation icons