JSFiddle - React, Tailwind, and code Playground

HTML

<div class="counter">
                    <p class="hours"></p>
                    <p class="в"></p>
                    <p class="minutes"></p>
                    <p class="seconds"></p>
                    <div>
                        <p>ЧАСЫ</p><p>МИНУТЫ</p><p>СЕКУНДЫ</p>
                    </div>
                </div>

CSS

.counter {
    margin: 14px auto 0;
    width: 344px;
    position: relative;
    padding: 10px;
    background: #fff;
    border-radius: 10px;
}
.counter > p {
    display: inline-block;
    font: 64px "Times new roman", sans;
    background: #ccc;
    height: 83px;
    width: 98px;
    padding: 5px 0 0 13px;
    letter-spacing: 24px;
    color:#2f2f2f;
    margin:0px;
}
.counter > div > p {
    display: inline-block;
    font-size: 15px;
    font-weight: bold;
    font: bold 15px Ubuntu, Arial, sans-serif;
    padding: 0;
    width: 112px;
    text-align: center;
    margin:0px;
}

JavaScript

function counter(){
        var now = new Date();
        var finDate = new Date("Mar,27,2019,05:25:00");
        var totalRemains = (finDate.getTime() - now.getTime());
        if (totalRemains > 1){
            var RemainsSec = (parseInt(totalRemains / 1000));
            var RemainsFullDays = (parseInt(RemainsSec/(24 * 60 * 60)));
            if (RemainsFullDays < 10){
                RemainsFullDays = "0" + RemainsFullDays
            };
            var secInLastDay = RemainsSec-RemainsFullDays * 24 * 3600;
            var RemainsFullHours = (parseInt(secInLastDay / 3600));
            if (RemainsFullHours < 10){
                RemainsFullHours = "0" + RemainsFullHours
            };
            var secInLastHour = secInLastDay - RemainsFullHours * 3600;
            var RemainsMinutes = (parseInt(secInLastHour / 60));
            if (RemainsMinutes < 10){
                RemainsMinutes = "0" + RemainsMinutes
            };
            var lastSec = secInLastHour - RemainsMinutes * 60;
            if (lastSec < 10){
                lastSec = "0" + lastSec
            };
            // var mcend = Date.parse("Jan 1, 2009, 00:00:00");
            // var mcnow = now.getTime();
            // var mc = ((mcend - mcnow)/10).toFixed(0).substr(8);

            $(".counter .days").html(RemainsFullDays);
            $(".counter .hours").html(RemainsFullHours);
            $(".counter .minutes").html(RemainsMinutes);
            $(".counter .seconds").html(lastSec);
        }
        else {
            $(".counter").html("Время вышло.");
        }
    };
    setInterval(counter, 1000);