bootstrapSelect title

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.4/css/bootstrap-select.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/popper.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.4/js/bootstrap-select.js"></script>
<select id="mySelect" class="selectpicker form-control">
    <option data-hidden="true" value="" disable>Please select a type of fruit…</option>
    <option title="a" value="apple">Apple</option>
    <option title="b" value="pear">Pear</option>
    <option title="c" value="banana">Banana</option>
    <option title="d" value="orange">Orange</option>
</select>

CSS

/* bootstrap-select issue with bootstrap 4!
https://github.com/silviomoreto/bootstrap-select/issues/1135 */
.bootstrap-select.show>.dropdown-menu>.dropdown-menu {
    display: block;
}

.bootstrap-select > .dropdown-menu > .dropdown-menu li.hidden{
    display:none;
}

.bootstrap-select > .dropdown-menu > .dropdown-menu li a{
    display: block;
    width: 100%;
    padding: 3px 1.5rem;
    clear: both;
    font-weight: 400;
    color: #292b2c;
    text-align: inherit;
    white-space: nowrap;
    background: 0 0;
    border: 0;
}