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Adding Classes

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CSS

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CSS Base

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HTML 

              
                <link href="https://fonts.googleapis.com/css?family=Orbitron|Text+Me+One" rel="stylesheet">

<div class="container">

  <div class="ClockHolder">

    <div class="WeekDays">
      <span>sat</span>
      <span>sun</span>
      <span>mon</span>
      <span>tue</span>
      <span>wed</span>
      <span>thu</span>
      <span>fri</span>
    </div>

    <div class="TimeHolder">

      <div class="TimeOptions">

        <i class="fas fa-clock" data-title="Time"></i>
        <i class="fas fa-stopwatch" data-title="StopWatch"></i>
        <i class="far fa-clock" data-title="CountDown"></i>

      </div>

      <div class="Numbers">

        <div class="NumberHolder H1">

          <span class="d1"></span>
          <span class="d2"></span>
          <span class="d3"></span>
          <span class="d4"></span>
          <span class="d5"></span>
          <span class="d6"></span>
          <span class="d7"></span>

        </div>

        <div class="NumberHolder H2">

          <span class="d1"></span>
          <span class="d2"></span>
          <span class="d3"></span>
          <span class="d4"></span>
          <span class="d5"></span>
          <span class="d6"></span>
          <span class="d7"></span>

        </div>

        <span>:</span>

        <div class="NumberHolder M1">

          <span class="d1"></span>
          <span class="d2"></span>
          <span class="d3"></span>
          <span class="d4"></span>
          <span class="d5"></span>
          <span class="d6"></span>
          <span class="d7"></span>

        </div>

        <div class="NumberHolder M2">

          <span class="d1"></span>
          <span class="d2"></span>
          <span class="d3"></span>
          <span class="d4"></span>
          <span class="d5"></span>
          <span class="d6"></span>
          <span class="d7"></span>

        </div>

        <span>:</span>

        <div class="NumberHolder S1">

          <span class="d1"></span>
          <span class="d2"></span>
          <span class="d3"></span>
          <span class="d4"></span>
          <span class="d5"></span>
          <span class="d6"></span>
          <span class="d7"></span>

        </div>

        <div class="NumberHolder S2">

          <span class="d1"></span>
          <span class="d2"></span>
          <span class="d3"></span>
          <span class="d4"></span>
          <span class="d5"></span>
          <span class="d6"></span>
          <span class="d7"></span>

        </div>

      </div>

      <div class="AlarmInput">
        <input type="number" placeholder="Enter Seconds">
      </div>

      <div class="TimeFormat">

        <div class="Type">
          <span>12hr</span>
          <span class="active">24hr</span>
        </div>

        <div class="Formats">
          <span>am</span>
          <span>pm</span>
        </div>

        <div class="control">

          <span class="Start active"><i class="fas fa-play"></i>Start</span>
          <span class="Pause"><i class="fas fa-pause"></i>Pause</span>
          <span class="Stop active"><i class="fas fa-stop"></i>Stop</span>

        </div>

      </div>

    </div>

  </div>

</div>
!

CSS 

              
                /* Css Reset */

html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
  display: block;
}
body {
  line-height: 1;
}
ol,
ul {
  list-style: none;
}
blockquote,
q {
  quotes: none;
}
blockquote:before,
blockquote:after,
q:before,
q:after {
  content: "";
  content: none;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* Css Code */

body {
  background-color: #7b1fa2;
  font-family: "Text Me One", sans-serif;
}

.container {
  width: 90%;
  max-width: 1400px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  justify-content: center;
}

.ClockHolder {
  width: 500px;
  background-color: #1b252a;
  padding: 30px 50px;
  border-radius: 15px;
  border: 3px solid #0277bd;
  position: relative;
}

.ClockHolder::after {
  content: " ";
  position: absolute;
  bottom: -15px;
  left: 50%;
  width: 70%;
  height: 15px;
  background-color: #0277bd;
  transform: translate(-50%, 0);
  border-radius: 3px 3px 8px 8px;
}

.ClockHolder::before {
}

.WeekDays {
  display: flex;
  width: 100%;
  justify-content: space-between;
  text-transform: uppercase;
  color: #646c72;
  cursor: default;
}

.WeekDays .active {
  color: aliceblue;
  position: relative;
}

.WeekDays .active::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 0;
  height: 2px;
  width: 100%;
  background-color: aliceblue;
}

.Numbers,
.TimeHolder {
  display: flex;
  justify-content: space-around;
  width: 100%;
  padding: 20px 0 5px;
  align-items: flex-end;
}

.NumberHolder {
  position: relative;
  width: 60px;
  height: 95px;
}

.d1,
.d2,
.d3,
.d4,
.d5,
.d6,
.d7 {
  width: 8px;
  height: 40px;
  background-color: azure;
  position: absolute;
}

.d1::after,
.d2::after,
.d3::after,
.d4::after,
.d5::after,
.d6::after,
.d7::after {
  content: "";
  position: absolute;
  background-color: azure;
  width: 7px;
  height: 7px;
  top: -7px;
  left: 0;
  clip-path: polygon(0 0, 0% 100%, 100% 100%);
}

.d1::before,
.d2::before,
.d3::before,
.d4::before,
.d5::before,
.d6::before,
.d7::before {
  content: "";
  position: absolute;
  background-color: azure;
  width: 7px;
  height: 7px;
  bottom: -7px;
  left: 0;
  clip-path: polygon(0 0, 100% 0, 0 100%);
}
.d7 {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(90deg);
}

.d7::before {
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.d7::after {
  clip-path: polygon(0 100%, 100% 100%, 50% 0);
}

@keyframes From01 {
  from {
    top: 0;
    left: 0;
  }
  to {
    top: 0;
    left: calc(100% - 7px);
    transform: rotate(180deg);
  }
}
@keyframes From02 {
  from {
    bottom: 0;
    left: 0;
  }
  to {
    bottom: 0;
    left: calc(100% - 7px);
    transform: rotate(180deg);
  }
}
@keyframes From05 {
  from {
    top: -22px;
    left: 7px;
    transform: rotate(90deg) translate(-50%, -50%);
  }
  to {
    top: 0;
    left: calc(100% - 7px);
    transform: rotate(180deg);
  }
}
@keyframes From06 {
  from {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
  to {
    bottom: 0;
    left: calc(100% - 7px);
    transform: rotate(180deg) translate(0, 0);
  }
}
.TimeOptions {
  display: flex;
  flex-direction: column;
  color: aliceblue;
}

.Numbers > span {
  font-size: 100px;
  color: aliceblue;
}

.NumberHolder {
  margin: 0 7px;
}

.Formats span {
  display: none;
  color: aliceblue;
  font-size: 2em;
  cursor: default;
}

.Formats .active {
  display: block;
}

.Type {
  display: flex;
  flex-direction: column;
  color: #98afaf;
}

.Type span {
  position: relative;
  margin: 2px 0;
  cursor: pointer;
}

.Type span::before {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: #98afaf;
  transition: all 0.4s ease;
}

.Type span:hover::before {
  width: 100%;
}

.TimeFormat {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 110px;
}

.Type .active {
  color: aquamarine;
}

.Type .active::after {
  content: "\f053";
  font-weight: 900;
  font-family: "Font Awesome 5 Free";
  position: absolute;
  top: 50%;
  right: -20px;
  transform: translate(-50%, -50%);
}

.Type .active::before {
  width: 100%;
}

.TimeOptions i {
  margin: 10px 3px;
  position: relative;
  cursor: pointer;
}

.TimeOptions i::after {
  display: block;
  opacity: 0;
  pointer-events: none;
  position: absolute;
  background: #fff;
  color: #646464;
  content: attr(data-title);
  font-size: 12px;
  padding: 3px 11px;
  top: -45%;
  left: 50%;
  white-space: nowrap;
  transform: translate(-50%, -50%) scale3d(0.2, 0.2, 1);
  transition: all 0.35s ease-in-out;
  line-height: initial;
  border-radius: 100px;
  z-index: 20;
}

.control {
  display: none;
  color: #f0ffff;
  position: relative;
  margin-left: 10px;
}

.control span {
  position: relative;
  cursor: pointer;
  text-align: center;
  display: none;
  margin-bottom: 20px;
}

.control .Pause {
  display: none;
}
.control span.active {
  display: block;
}

.control span i {
  margin-bottom: 5px;
}

.TimeOptions i:hover::after {
  opacity: 1;
  transform: translate(-50%, -50%) scale3d(1, 1, 1);
}

.StopWatch .Type,
.StopWatch .Formats,
.Alarm .Type,
.Alarm .Formats {
  display: none;
}

.StopWatch .control,
.Alarm .control {
  display: block;
}

.ClockHolder::before {
  content: "";
  position: absolute;
  width: 110%;
  height: 10px;
  background-color: #00000077;
  bottom: -25px;
  left: -5%;
  border-radius: 100%;
  filter: blur(5px);
}

.AlarmInput {
  display: none;
}

.AlarmInput input {
  height: 100px;
  font-size: 100px;
  max-width: 400px;
  font-family: "Orbitron", sans-serif;
  background-color: #1b252a;
  border: none;
  padding: 5px 20px;
  color: azure;
  letter-spacing: 5px;
  position: relative;
}

.AlarmInput input:focus {
  border: 1px solid #fff;
}

.Alarm .AlarmInput {
  display: block;
}
.Alarm .AlarmInput.DisNone {
  display: none;
}

.AlarmInput input::-webkit-input-placeholder {
  /* Chrome/Opera/Safari */
  font-size: 30px;
}
.AlarmInput input::-moz-placeholder {
  /* Firefox 19+ */
  font-size: 30px;
}
.AlarmInput input:-ms-input-placeholder {
  /* IE 10+ */
  font-size: 30px;
}
.AlarmInput input:-moz-placeholder {
  /* Firefox 18- */
  font-size: 30px;
}

.show1 .d1 {
  animation: From01 0.35s ease 1 forwards;
}
.show1 .d2 {
  animation: From02 0.35s ease 1 forwards;
}
.show1 .d3 {
  top: 0;
  left: calc(100% - 7px);
  transform: rotate(180deg);
}
.show1 .d4 {
  bottom: 0;
  left: calc(100% - 7px);
  transform: rotate(180deg);
}

.show1 .d5 {
  animation: From05 0.35s ease 1 forwards;
}
.show1 .d6 {
  animation: From06 0.35s ease 1 forwards;
}
.show1 .d7 {
  opacity: 0;
}

.show2 .d1 {
  top: 0;
  left: calc(100% - 7px);
  transform: rotate(180deg);
}
.show2 .d2 {
  animation: From12 0.35s ease 1 forwards;
}
.show2 .d3 {
  top: 0;
  left: calc(100% - 7px);
  transform: rotate(180deg);
}
.show2 .d4 {
  animation: From16 0.35s ease 1 forwards;
}
.show2 .d5 {
  animation: From15 0.35s ease 1 forwards;
}
.show2 .d6 {
  animation: From16 0.35s ease 1 forwards;
}
.show2 .d7 {
  opacity: 1;
  transition: opacity 0.35s ease;
}

@keyframes From12 {
  from {
    bottom: 0;
    left: calc(100% - 7px);
    transform: rotate(180deg);
  }
  to {
    bottom: 0;
    left: 0;
  }
}
@keyframes From15 {
  from {
    top: 0;
    left: calc(100% - 7px);
    transform: rotate(180deg);
  }
  to {
    top: -22px;
    left: 7px;
    transform: rotate(90deg) translate(-50%, -50%);
  }
}
@keyframes From16 {
  from {
    bottom: 0;
    left: calc(100% - 7px);
    transform: rotate(180deg) translate(0, 0);
  }
  to {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
}
.show3 .d1 {
  top: 0;
  left: calc(100% - 7px);
  transform: rotate(180deg);
}
.show3 .d2 {
  animation: From22 0.35s ease 1 forwards;
}
.show3 .d3 {
  top: 0;
  right: 0;
  transform: rotate(180deg);
}
.show3 .d4 {
  animation: From24 0.35s ease 1 forwards;
}

.show3 .d5 {
  top: -22px;
  left: 7px;
  transform: rotate(90deg) translate(-50%, -50%);
}
.show3 .d6 {
  animation: From24 0.35s ease 1 forwards;
}
.show3 .d7 {
  opacity: 1;
  transition: opacity 0.35s ease;
}

@keyframes From22 {
  from {
    bottom: 0;
    left: 0;
  }
  to {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
}
@keyframes From24 {
  from {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
  to {
    bottom: 0;
    right: 0;
    transform: rotate(180deg) translate(0, 0);
  }
}
.show4 .d1 {
  animation: From31 0.35s ease 1 forwards;
}
.show4 .d2 {
  top: 0;
  right: 0;
  transform: rotate(180deg);
}
.show4 .d3 {
  top: 0;
  right: 0;
  transform: rotate(180deg);
}
.show4 .d4 {
  bottom: 0;
  right: 0;
  transform: rotate(180deg);
}

.show4 .d5 {
  animation: From31 0.35s ease 1 forwards;
}
.show4 .d6 {
  animation: From36 0.35s ease 1 forwards;
}
.show4 .d7 {
  opacity: 1;
  transition: opacity 0.35s ease;
}

@keyframes From31 {
  from {
    top: -22px;
    left: 7px;
    transform: rotate(90deg) translate(-50%, -50%);
  }
  to {
    top: 0;
    left: 0;
  }
}
@keyframes From32 {
  from {
    bottom: 0;
    left: 0;
  }
  to {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
}
@keyframes From36 {
  from {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
  to {
    bottom: 0;
    right: 0;
    transform: rotate(180deg) translate(0, 0);
  }
}
.show5 .d1 {
  top: 0;
  left: 0;
}
.show5 .d2 {
  bottom: 0;
  right: 0;
  transform: rotate(180deg);
}
.show5 .d3 {
  animation: From43 0.35s ease 1 forwards;
}
.show5 .d4 {
  bottom: 0;
  right: 0;
  transform: rotate(180deg);
}

.show5 .d5 {
  animation: From43 0.35s ease 1 forwards;
}
.show5 .d6 {
  animation: From46 0.35s ease 1 forwards;
}
.show5 .d7 {
  opacity: 1;
  transition: opacity 0.35s ease;
}

@keyframes From43 {
  from {
    top: 0;
    right: 0;
    transform: rotate(180deg) translate(0, 0);
  }
  to {
    top: -22px;
    left: 7px;
    transform: rotate(90deg) translate(-50%, -50%);
  }
}
@keyframes From42 {
  from {
    bottom: 0;
    left: 0;
  }
  to {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
}
@keyframes From46 {
  from {
    bottom: 0;
    right: 0;
    transform: rotate(180deg) translate(0, 0);
  }
  to {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
}
.show6 .d1 {
  top: 0;
  left: 0;
}
.show6 .d2 {
  animation: From52 0.35s ease 1 forwards;
}
.show6 .d3 {
  bottom: 0;
  right: 0;
  transform: rotate(180deg);
}
.show6 .d4 {
  bottom: 0;
  right: 0;
  transform: rotate(180deg);
}

.show6 .d5 {
  top: -22px;
  left: 7px;
  transform: rotate(90deg) translate(-50%, -50%);
}
.show6 .d6 {
  bottom: -22px;
  left: 7px;
  transform: rotate(-90deg) translate(-50%, 50%);
}
.show6 .d7 {
  opacity: 1;
  transition: opacity 0.35s ease;
}

@keyframes From52 {
  from {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
  to {
    bottom: 0;
    left: 0;
  }
}
.show7 .d1 {
  animation: From61 0.35s ease 1 forwards;
}
.show7 .d2 {
  animation: From62 0.35s ease 1 forwards;
}
.show7 .d3 {
  animation: From63 0.35s ease 1 forwards;
}
.show7 .d4 {
  bottom: 0;
  right: 0;
  transform: rotate(180deg);
}

.show7 .d5 {
  top: -22px;
  left: 7px;
  transform: rotate(90deg) translate(-50%, -50%);
}
.show7 .d6 {
  animation: From66 0.35s ease 1 forwards;
}
.show7 .d7 {
  opacity: 0;
  transition: opacity 0.35s ease;
}

@keyframes From61 {
  from {
    top: 0;
    left: 0;
  }
  to {
    top: 0;
    right: 0;
    transform: rotate(180deg);
  }
}
@keyframes From63 {
  from {
    top: -22px;
    left: 7px;
    transform: rotate(90deg) translate(-50%, -50%);
  }
  to {
    top: 0;
    right: 0;
    transform: rotate(180deg);
  }
}
@keyframes From62 {
  from {
    bottom: 0;
    left: 0;
  }
  to {
    bottom: 0;
    right: 0;
    transform: rotate(180deg);
  }
}

@keyframes From66 {
  from {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
  to {
    bottom: 0;
    right: 0;
    transform: rotate(180deg);
  }
}
.show8 .d1 {
  animation: From71 0.35s ease 1 forwards;
}
.show8 .d2 {
  animation: From72 0.35s ease 1 forwards;
}
.show8 .d3 {
  top: 0;
  right: 0;
  transform: rotate(180deg);
}
.show8 .d4 {
  bottom: 0;
  right: 0;
  transform: rotate(180deg);
}

.show8 .d5 {
  top: -22px;
  left: 7px;
  transform: rotate(90deg) translate(-50%, -50%);
}
.show8 .d6 {
  animation: From76 0.35s ease 1 forwards;
}
.show8 .d7 {
  opacity: 1;
  transition: opacity 0.35s ease;
}

@keyframes From71 {
  from {
    top: -22px;
    left: 7px;
    transform: rotate(90deg) translate(-50%, -50%);
  }
  to {
    top: 0;
    left: 0;
  }
}
@keyframes From72 {
  from {
    bottom: 0;
    right: 0;
    transform: rotate(180deg);
  }
  to {
    bottom: 0;
    left: 0;
  }
}

@keyframes From76 {
  from {
    bottom: 0;
    right: 0;
    transform: rotate(180deg);
  }
  to {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
}

.show9 .d1 {
  top: 0;
  left: 0;
}
.show9 .d2 {
  animation: From82 0.35s ease 1 forwards;
}
.show9 .d3 {
  top: 0;
  right: 0;
  transform: rotate(180deg);
}
.show9 .d4 {
  bottom: 0;
  right: 0;
  transform: rotate(180deg);
}

.show9 .d5 {
  top: -22px;
  left: 7px;
  transform: rotate(90deg) translate(-50%, -50%);
}
.show9 .d6 {
  bottom: -22px;
  left: 7px;
  transform: rotate(-90deg) translate(-50%, 50%);
}
.show9 .d7 {
  opacity: 1;
  transition: opacity 0.35s ease;
}

@keyframes From82 {
  from {
    bottom: 0;
    left: 0;
  }
  to {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
}

.show0 .d1 {
  top: 0;
  left: 0;
}
.show0 .d2 {
  animation: From92 0.35s ease 1 forwards;
}
.show0 .d3 {
  top: 0;
  right: 0;
  transform: rotate(180deg);
}
.show0 .d4 {
  bottom: 0;
  right: 0;
  transform: rotate(180deg);
}

.show0 .d5 {
  top: -22px;
  left: 7px;
  transform: rotate(90deg) translate(-50%, -50%);
}
.show0 .d6 {
  bottom: -22px;
  left: 7px;
  transform: rotate(-90deg) translate(-50%, 50%);
}
.show0 .d7 {
  opacity: 0;
  transition: opacity 0.35s ease;
}

@keyframes From92 {
  from {
    bottom: -22px;
    left: 7px;
    transform: rotate(-90deg) translate(-50%, 50%);
  }
  to {
    bottom: 0;
    left: 0;
  }
}

.BgAnimation {
  animation: Colors 0.35s ease infinite alternate;
}

@keyframes Colors {
  0% {
    background-color: #7b1fa2;
  }
  100% {
    background-color: red;
  }
}
!

JS 

              
                var Format = 1,
  TimeHolder = 0,
  StopChecker = 0;

function resetTimer() {
  $(".S1").removeClass().addClass("NumberHolder S1 show0");
  $(".S2").removeClass().addClass("NumberHolder S2 show0");

  $(".M1").removeClass().addClass("NumberHolder M1 show0");
  $(".M2").removeClass().addClass("NumberHolder M2 show0");

  $(".H1").removeClass().addClass("NumberHolder H1 show0");
  $(".H2").removeClass().addClass("NumberHolder H2 show0");
}

function SetDay(DD) {
  $(".WeekDays span:nth-child(" + ((DD + 2) % 7) + ")").addClass("active");
}

function Run24hr(S1, S2, M1, M2, H1, H2) {
  $(".S1")
    .removeClass()
    .addClass("NumberHolder S1 show" + S1);
  $(".S2")
    .removeClass()
    .addClass("NumberHolder S2 show" + S2);

  $(".M1")
    .removeClass()
    .addClass("NumberHolder M1 show" + M1);
  $(".M2")
    .removeClass()
    .addClass("NumberHolder M2 show" + M2);

  $(".H1")
    .removeClass()
    .addClass("NumberHolder H1 show" + H1);
  $(".H2")
    .removeClass()
    .addClass("NumberHolder H2 show" + H2);
}

function Run12hr(S1, S2, M1, M2, HH) {
  if (HH > 12) {
    HH = HH - 12;
    $(".Formats span:nth-child(2)").addClass("active");
  } else {
    $(".Formats span:nth-child(1)").addClass("active");
  }
  var H1 = Math.floor(HH / 10),
    H2 = HH % 10;

  $(".S1")
    .removeClass()
    .addClass("NumberHolder S1 show" + S1);
  $(".S2")
    .removeClass()
    .addClass("NumberHolder S2 show" + S2);

  $(".M1")
    .removeClass()
    .addClass("NumberHolder M1 show" + M1);
  $(".M2")
    .removeClass()
    .addClass("NumberHolder M2 show" + M2);

  if (H1 === 0) {
    $(".H1").fadeOut(0);
  } else {
    $(".H1")
      .fadeIn()
      .removeClass()
      .addClass("NumberHolder H1 show" + H1);
  }
  $(".H2")
    .removeClass()
    .addClass("NumberHolder H2 show" + H2);
}

function Stopwatch(TimeHolder) {
  var HH = Math.floor(TimeHolder / 3600),
    MM = Math.floor((TimeHolder - HH * 3600) / 60),
    SS = Math.floor(TimeHolder - HH * 3600 - MM * 60);

  var S1 = Math.floor(SS / 10),
    S2 = SS % 10,
    M1 = Math.floor(MM / 10),
    M2 = MM % 10,
    H1 = Math.floor(HH / 10),
    H2 = HH % 10;

  Run24hr(S1, S2, M1, M2, H1, H2);
}

function update_time() {
  var dt = new Date(),
    HH = dt.getHours(),
    MM = dt.getMinutes(),
    SS = dt.getSeconds(),
    DD = dt.getDay();
  SetDay(DD);

  var S1 = Math.floor(SS / 10),
    S2 = SS % 10,
    M1 = Math.floor(MM / 10),
    M2 = MM % 10,
    H1 = Math.floor(HH / 10),
    H2 = HH % 10;

  if (Format === 1) {
    Run24hr(S1, S2, M1, M2, H1, H2);
  } else if (Format === 2) {
    Run12hr(S1, S2, M1, M2, HH);
  } else if (Format === 3 && StopChecker === 0) {
    TimeHolder++;
    Stopwatch(TimeHolder);
  } else if (Format === 4 && StopChecker === 0) {
    TimeHolder--;
    if (TimeHolder === 0) {
      AlarmOut();
    } else {
      Stopwatch(TimeHolder);
    }
  }

  setTimeout(update_time, 1000);
}

$(".Type span").on("click", function () {
  $(".Type .active").removeClass("active");
  $(this).addClass("active");
  var T = $(this).html();
  if (T === "24hr") {
    Format = 1;
    $(".H1").fadeIn();
    $(".Formats span").removeClass("active");
  } else {
    Format = 2;
  }
});

$(".fa-stopwatch").on("click", function () {
  $("body").removeClass("BgAnimation");
  $(".H1").fadeIn();
  if (!$(".TimeHolder").hasClass("StopWatch")) {
    Format = 3;
    resetTimer();
    StopChecker = 1;
    $(".TimeHolder").removeClass().addClass("TimeHolder StopWatch");
    $(".Numbers").fadeIn(0);
    $(".Pause").removeClass("active");
    $(".Start").addClass("active");
    TimeHolder = 0;
  }
});

$(".Start").on("click", function () {
  $("body").removeClass("BgAnimation");
  if (Format === 3) {
    StopChecker = 0;
    $(this).removeClass("active");
    $(".Pause").addClass("active");
  } else if (Format === 4) {
    TimeHolder = $(".AlarmInput input").val();
    if (TimeHolder > 0) {
      StopChecker = 0;
      resetTimer();
      $(this).removeClass("active");
      $(".Pause").addClass("active");
      $(".AlarmInput").addClass("DisNone");
      $(".Numbers").fadeIn(0);
    }
  }
});

$(".Pause").on("click", function () {
  StopChecker = 1;
  $(this).removeClass("active");
  $(".Start").addClass("active");
});

$(".Stop").on("click", function () {
  $("body").removeClass("BgAnimation");
  if (Format === 3) {
    StopChecker = 1;
    TimeHolder = 0;
    resetTimer();
    $(".Pause").removeClass("active");
    $(".Start").addClass("active");
  } else if (Format === 4) {
    resetTimer();
    StopChecker = 1;
    $(".AlarmInput").removeClass("DisNone");
    $(".Numbers").fadeOut(0);
    $(".AlarmInput input").val("");
    $(".Pause").removeClass("active");
    $(".Start").addClass("active");
  }
});

$(".fas.fa-clock").on("click", function () {
  $("body").removeClass("BgAnimation");

  if ($(".Type .active").html() === "12hr") {
    Format = 2;
  } else {
    Format = 1;
  }

  StopChecker = 0;
  $(".TimeHolder").removeClass().addClass("TimeHolder");
  $(".Numbers").fadeIn(0);
});

$(".far.fa-clock").on("click", function () {
  $("body").removeClass("BgAnimation");
  $(".H1").fadeIn();
  if (!$(".TimeHolder").hasClass("Alarm")) {
    $(".TimeHolder").removeClass().addClass("TimeHolder Alarm");
    Format = 4;
    resetTimer();
    StopChecker = 1;
    $(".AlarmInput").removeClass("DisNone");
    $(".TimeHolder").addClass("Alarm");
    $(".Numbers").fadeOut(0);
    $(".Pause").removeClass("active");
    $(".Start").addClass("active");
  }
});

// Alarm Out
function AlarmOut() {
  $("body").addClass("BgAnimation");
  resetTimer();
  StopChecker = 1;
}

update_time();
!
999px

Console