<select class="form-control"id="sel1"name="sellist1"><option>1</option><option>2</option><option>3</option><option>4</option></select>

<select multiple class="form-control"id="sel2"name="sellist2"><option>1</option><option>2</option><option>3</option><option>4</option><option>5</option></select>

<div class="input-group mb-3"><div class="input-group-prepend"><label class="input-group-text"for="inputGroupSelect01">Options</label></div><select class="form-control"id="inputGroupSelect01"><option selected="">Choose...</option><option value="1">One</option><option value="2">Two</option><option value="3">Three</option></select></div><div class="input-group"><select class="form-control"id="inputGroupSelect02"><option selected="">Choose...</option><option value="1">One</option><option value="2">Two</option><option value="3">Three</option></select><div class="input-group-append"><label class="input-group-text"for="inputGroupSelect02">Options</label></div></div>

<div class="form-group"><select class="form-control "><option>Java</option><option>Javascript</option><option>PHP</option><option>Visual Basic</option></select></div>

<select id="multiple"class="js-states form-control"multiple><option>Red</option><option>Green</option><option>Blue</option><option>Yellow</option></select>

<select class="custom-select form-control"><option selected="">Open this menu</option><option value="IT">IT</option><option value="Blade Runner">Blade Runner</option><option value="Thor Ragnarok">Thor Ragnarok</option></select>

<select disabled="disabled"id="disabledSelect"class="form-control"><option>Disabled select</option><option>1</option><option>2</option><option>3</option></select>

<div class="input-group mb-3"><div class="input-group-prepend"><label class="input-group-text"for="inputGroupSelect03">Options</label></div><select class="custom-select"id="inputGroupSelect03"><option selected>Choose...</option><option value="1">One</option><option value="2">Two</option><option value="3">Three</option></select></div>

<form><select class="custom-select custom-select-sm mb-3"><option selected>Small Custom Select Menu</option><option value="volvo">Volvo</option><option value="fiat">Fiat</option><option value="audi">Audi</option></select><select name="cars"class="custom-select mb-3"><option selected>Default Custom Select Menu</option><option value="volvo">Volvo</option><option value="fiat">Fiat</option><option value="audi">Audi</option></select><select name="cars"class="custom-select custom-select-lg mb-3"><option selected>Large Custom Select Menu</option><option value="volvo">Volvo</option><option value="fiat">Fiat</option><option value="audi">Audi</option></select></form>