<form action="search.php" method="get"> <div class="input-group"> <input type="text" name="keyword" class="form-control" placeholder="以空白隔開關鍵字" aria-label="Search for..." style="font-family: 微軟正黑體, FontAwesome"> <span class="input-group-btn"> <button class="btn btn-secondary" type="submit"><i class="fa fa-search" aria-hidden="true"></i></button> </span> </div> </form>