Playing an Animation with Function Call

[zyker.tompos]

I am working on a game that needs an animation to play when I call a function. The function moves two divs slowly up and down similarly to a slot machine. Here are some animation frames:
Start:

In-between:

End:

This is being displayed with html and CSS. Here is the animation code:
Html

<div id="day-swapper-contain" onclick="day_switch()">
                    <div class="day-swapper-inner-green center">
                        <div>Good</div>
                    </div>
                    <div class="day-swapper-inner-red center">
                        <div>Bad</div>
                    </div>
                </div>

CSS

#day-swapper-contain{
    width: 15%;
    overflow: hidden;
    height: 75px;
}

.day-swapper-inner-red, .day-swapper-inner-green{
    color: var(--text-color);
    text-align: center;
    font-size: 4rem;
    line-height: 5rem;
    height: 100%;
    width: 100%;
    border: var(--bg-color) solid 5px;
    justify-content: space-evenly;
    position: relative;
    animation-name: good-bad;
    animation-duration: 3s;
    animation-timing-function: ease-in-out;
    animation-play-state: paused;
}

.day-swapper-inner-green{
    background-color: green;
}

.day-swapper-inner-red{
    background-color: red;
}

@keyframes good-bad{
    0% {
        top: 0px;
    }
    100% {
        top: -75px;
    }
}

Here is the JavaScript I am using to trying to play it at a function call.

let good_day = document.querySelector('.day-swapper-inner-green');
let bad_day = document.querySelector('.day-swapper-inner-red');

let good_day_state = true;

function day_switch(){
    state = !good_day_state;
    if (state){
        good_day.style.animationDirection = 'reverse';
        bad_day.style.animationDirection = 'reverse';
        good_day.style.animationPlayState = 'running';
        bad_day.style.animationPlayState = 'running';
    } else {
        good_day.style.animationDirection = 'normal';
        bad_day.style.animationDirection = 'normal';
        good_day.style.animationPlayState = 'running';
        bad_day.style.animationPlayState = 'running';
    }
    return state;
}

Is there anything I am doing wrong?
Is there any functions I should know to get this to work?
Is there any code you could show me to help me with my implementation?
All help is appreciated.

[zyker.tompos]

Is there any way I can make the animation play once? I was looking into maybe incrementing the animationIterationCount by 1 so the animation will iterate only once when I call the function.

[zyker.tompos]

Here is my final solution that got it just the way I wanted:
CSS:

#day-swapper-contain{
    width: 15%;
    overflow: hidden;
    height: 75px;
}

.day-swapper-inner-red, .day-swapper-inner-green{
    color: var(--text-color);
    text-align: center;
    font-size: 4rem;
    line-height: 5rem;
    height: 100%;
    width: 100%;
    border: var(--bg-color) solid 5px;
    justify-content: space-evenly;
    position: relative;
    animation-name: good-bad;
    animation-duration: 3s;
    animation-timing-function: ease-in-out;
    animation-play-state: paused;
    animation-direction: alternate;
    animation-iteration-count: infinite;
}

.day-swapper-inner-green{
    background-color: green;
    font-size: 3rem;
}

.day-swapper-inner-red{
    background-color: red;
}

@keyframes good-bad{
    0% {
        top: 0px;
    }
    100% {
        top: -72px;
    }
}

JavaScript:

const good_day = document.getElementById('good_day');
const bad_day = document.getElementById('bad_day');

let good_day_state = true;

function day_switch(){
    good_day.style.animationPlayState = 'running';
    bad_day.style.animationPlayState = 'running';
    setTimeout(() => { good_day.style.animationPlayState = 'paused'}
    , 3000);
    setTimeout(() => { bad_day.style.animationPlayState = 'paused'}
    , 3000);
}
Thank You everyone for all the help!

[camperextraordinaire]

I refactored your approach to get rid of the setTimeout and simplified the overall structure and logic of everything.

HTML

<div class="container">
  <div class="slider" onclick="day_switch()">
    <div class="good-day">Good</div>
    <div class="bad-day">Bad</div>
  </div>
</div>

CSS

.container {
  width: 150px;
  overflow: hidden;
  height: 75px;
}

.good-day,
.bad-day {
  text-align: center;
  font-size: 3rem;
  line-height: 5rem;
  width: 100%;
}

.good-day {
  background-color: green;
}

.bad-day {
  background-color: red;
}

.slider {
  animation-duration: 3s;
  animation-fill-mode: forwards;
  position: relative;
}

.animate-good-to-bad-true {
  animation-name: good-to-bad;
}

.animate-good-to-bad-false {
  animation-name: bad-to-good;
}

@keyframes good-to-bad {
  0% {
    top: 0px;
  }
  100% {
    top: -80px;
  }
}

@keyframes bad-to-good {
  0% {
    top: -80px;
  }
  100% {
    top: 0px;
  }
}

JS

const slider = document.querySelector(".slider");
let goodDayState = true;

function day_switch() {
  slider.classList.add("animate-good-to-bad-" + goodDayState);
  slider.classList.remove("animate-good-to-bad-" + !goodDayState);
  goodDayState = !goodDayState;
}