Bootstrap snippet and html example. custom search form

<div class="container">
    <div itemscope="" itemtype="http://schema.org/WebSite">
        <meta itemprop="url" content="https://www.bootdey.com/bootstrap-snippets" />
        <form action="/bootstrap-snippets" itemprop="potentialAction" itemtype="http://schema.org/SearchAction" accept-charset="utf-8" id="SearchHomeForm" method="get">
            <input name="utf8" type="hidden" value="✓" />
            <div class="form-group form-search">
                <meta itemprop="target" content="https://www.bootdey.com/bootstrap-snippets?q=" /> <input type="text" value="" name="q" id="q" class="form-control form-control-search" placeholder="Search" itemprop="query-input" />
                <button type="submit" class="btn btn-default btn-round btn-submit"><i class="glyphicon glyphicon-search icon-2x"></i></button>
            </div>
        </form>
    </div>

</div>

body{margin-top:20px;
background:#eee;
}
.form-search {
    max-width: 510px;
    padding: 0 15px;
    margin: 30px auto 0;
    position: relative;
}

.form-search .form-control-search {
    background-color: rgba(121,121,121,.55);
    border: none;
    border-radius: 30px;
    box-shadow: 0 0 0;
    color: #FFF;
    display: block;
    font-size: 20px;
    font-weight: 300;
    height: 50px;
    line-height: 1.42857;
    padding: 6px 20px;
    vertical-align: middle;
    transition: background-color .2s;
}
.form-search .btn-submit {
    position: absolute;
    right: 18px;
    border: none;
    padding: 10px 12px;
    height: 44px;
    line-height: 30px;
    width: 44px;
    display: block;
    top: 3px;
    opacity: .7;
    background: #FFF;
    color: #666;
    transition: all .2s;
}
.icon-2x {
    font-size: 1.8em;
}
.btn-round {
    border-width: 1px;
    border-radius: 30px!important;
    opacity: .79;
    padding: 9px 18px;
}