JSFiddle - React, Tailwind, and code Playground

HTML

<div id="yourSelectID" class="select">
    <div class="option-selection" data-value="none">12 месяцев <span class="percents2"> - 15%</span></div>
    <div class="option-container">
        <div class="option" data-value="1" value="15">12 месяцев <span class="percents2"> - 15%</span></div>
        <div class="option" data-value="2" value="10">6 месяцев <span class="percents2"> - 10%</span></div>
        <div class="option" data-value="3" value="5">3 месяца <span class="percents2"> - 5%</span></div>
    </div>
    <div class="option-expand">+</div>
</div>

CSS

.select {
    border:1px solid #444444;
    height:20px;
    display:inline-block;
    border-radius:3px;
}
.option-container {
    display:none;
    position:absolute;
    top:30px;
    border:1px solid;
    cursor:pointer;
}
.option-expand {
    float:left;
    cursor:pointer;
    padding:0 5px;
}
.option-selection {
   min-height:1px;
   float:left;
    padding:0 5px;
    width: auto;
    height: auto;
}
.option {
    padding:5px;
    background:#FFF;
    
    width: auto;
}
.percents2{
    color: red;
    float: right;
   }

JavaScript

<!-- $('.option-selection').width($('.option-selection').next('.option-container').width()-10); -->
$('.option-selection, .option-expand').click(function(e){
    e.preventDefault();
    $(this).parent().children('.option-container').stop();
    $(this).parent().children('.option-container').slideToggle(); 
});

$('.option').click(function(e){
    e.preventDefault();
    $this = $(this);
    var value = $this.attr('data-value');
    var name  = $this.html();
    $parent = $this.parent().parent().children('.option-selection');
    $parent.html(name);
    $parent.attr('data-value', value);
    $optionContainer = $this.parent();
    $optionContainer.slideToggle();
});


function getSelection(id){
    $selection = $('#'+id).children('.option-selection');
    var name = $selection.text();
    var value = $selection.attr('data-value');
    return {name: name, value: value};
};