I'm trying to do a pure HTML/CSS countdown animation but I'm struggling to make it work smoothly. For now I'm only covering minutes and seconds. Notice that I'm using animation-delay
property for resetting my countdown to a certain initial time.
For now everything is working fine, except the digit corresponding to the x10 minutes which is not changing sync with the rest of the digits. Following I will paste my code and two codepens, a first normal version with the correct timings for a normal behaviour and another one 10 times faster so you can quickly appreciate the problem.
@keyframes tick6 {
0% { margin-top: 0; }
16% { margin-top: -2rem; }
33% { margin-top: -4rem; }
50% { margin-top: -6rem; }
66% { margin-top: -8rem; }
83% { margin-top: -10rem; }
100% { margin-top: -12rem; }
}
@keyframes tick10 {
0% { margin-top: 0; }
10% { margin-top: -2rem; }
20% { margin-top: -4rem; }
30% { margin-top: -6rem; }
40% { margin-top: -8rem; }
50% { margin-top: -10rem; }
60% { margin-top: -12rem; }
70% { margin-top: -14rem; }
80% { margin-top: -16rem; }
90% { margin-top: -18rem; }
100% { margin-top: -20rem; }
}
body {
background-color: black;
}
.container {
background-color: white;
}
.digit {
display: inline-block;
height: 2rem;
overflow: hidden;
width: 1ch;
}
.digit span {
display: block;
height: 2rem;
width: 100%;
}
.minutes-digit-one {
animation: tick6 3600s step-end;
animation-iteration-count: infinite;
animation-delay: -540s;
}
.minutes-digit-two {
animation: tick10 600s step-end;
animation-iteration-count: infinite;
animation-delay: -540s;
}
.seconds-digit-one {
animation: tick6 60s step-end;
animation-iteration-count: infinite;
animation-delay: -540s;
}
.seconds-digit-two {
animation: tick10 10s;
animation-iteration-count: infinite;
animation-delay: -540s;
}
<div class="container">
<div class="digit">
<span class="minutes-digit-one">5</span>
<span>4</span>
<span>3</span>
<span>2</span>
<span>1</span>
<span>0</span>
<span>5</span>
</div>
<div class="digit">
<span class="minutes-digit-two">9</span>
<span>8</span>
<span>7</span>
<span>6</span>
<span>5</span>
<span>4</span>
<span>3</span>
<span>2</span>
<span>1</span>
<span>0</span>
<span>9</span>
</div>
<div class="digit">
<span>:</span>
</div>
<div class="digit">
<span class="seconds-digit-one">5</span>
<span>4</span>
<span>3</span>
<span>2</span>
<span>1</span>
<span>0</span>
<span>5</span>
</div>
<div class="digit">
<span class="seconds-digit-two">9</span>
<span>8</span>
<span>7</span>
<span>6</span>
<span>5</span>
<span>4</span>
<span>3</span>
<span>2</span>
<span>1</span>
<span>0</span>
<span>9</span>
</div>
</div>
Create one container in which all the elements are present. Inside this container add 2 divs in which one contain all time element like an hour, minutes, seconds, and milliseconds. and another div contains 3 buttons for start, stop, and reset. Now Style which you want I add this container in the center.
This is due to the percentage values of the keyframes. You are using 16%
while it should be 16.6667%
(100/6
) to be more exact and accurate, same thing with the others values.
When using 360s
or 3600s
as a duration you will have a clear difference between 16%
and 16.6667%
thus the state will change earlier and you will have the synchronisation issue. You may not notice this when using 6s
as duration with the seconds.
@keyframes tick6 {
0% { margin-top: 0; } /* 0*(100/6) */
16.6667% { margin-top: -2rem; } /* 1*(100/6) */
33.3333% { margin-top: -4rem; } /* 2*(100/6) */
50% { margin-top: -6rem; } /* 3*(100/6) */
66.6667% { margin-top: -8rem; } /* 4*(100/6) */
83.3333% { margin-top: -10rem; } /* 5*(100/6) */
100% { margin-top: -12rem; } /* 6*(100/6) */
}
@keyframes tick10 {
0% { margin-top: 0; }
10% { margin-top: -2rem; }
20% { margin-top: -4rem; }
30% { margin-top: -6rem; }
40% { margin-top: -8rem; }
50% { margin-top: -10rem; }
60% { margin-top: -12rem; }
70% { margin-top: -14rem; }
80% { margin-top: -16rem; }
90% { margin-top: -18rem; }
100% { margin-top: -20rem; }
}
body {
background-color: black;
}
.container {
background-color: white;
}
.digit {
display: inline-block;
height: 2rem;
overflow: hidden;
width: 1ch;
}
.digit span {
display: block;
height: 2rem;
width: 100%;
}
.minutes-digit-one {
animation: tick6 360s infinite step-end;
/*animation-delay: -54s;*/
}
.minutes-digit-two {
animation: tick10 60s infinite step-end;
/*animation-delay: -54s;*/
}
.seconds-digit-one {
animation: tick6 6s infinite step-end;
/*animation-delay: -54s;*/
}
.seconds-digit-two {
animation: tick10 1s infinite step-end;
}
<div class="container">
<div class="digit">
<span class="minutes-digit-one">5</span>
<span>4</span>
<span>3</span>
<span>2</span>
<span>1</span>
<span>0</span>
<span>5</span>
</div>
<div class="digit">
<span class="minutes-digit-two">9</span>
<span>8</span>
<span>7</span>
<span>6</span>
<span>5</span>
<span>4</span>
<span>3</span>
<span>2</span>
<span>1</span>
<span>0</span>
<span>9</span>
</div>
<div class="digit">
<span>:</span>
</div>
<div class="digit">
<span class="seconds-digit-one">5</span>
<span>4</span>
<span>3</span>
<span>2</span>
<span>1</span>
<span>0</span>
<span>5</span>
</div>
<div class="digit">
<span class="seconds-digit-two">9</span>
<span>8</span>
<span>7</span>
<span>6</span>
<span>5</span>
<span>4</span>
<span>3</span>
<span>2</span>
<span>1</span>
<span>0</span>
<span>9</span>
</div>
</div>
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