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HTML

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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HTML 

              
                <div id="parts">
        <div class="part part1">
           <p>Hey</p>
           <p>Let's</p>
           <p>Have Fun</p>
        </div>
        <div class="part part2">
            <p>Relax,</p>
            <p>Take</p>
            <p>It Easy</p>
        </div>
        <div class="part part3">
            <p>Make</p>
            <p>It</p>
            <p>True</p>
        </div>
        <div class="part part4">
            <p>Give</p>
            <p>All</p>
            <p>The Best</p>
        </div>
        <div class="part part5">
            <p>Live</p>
            <p>In</p>
            <p>The Moment</p>
        </div>
   </div>
!

CSS 

              
                * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    background-color:#1C0602;
    font-family: 'Merienda One', cursive;
    color: #FFEACE;
    font-size: 20px;
}
#parts {
   min-height: 100vh;
   overflow: hidden;
   display: flex; /*flex container*/
}
.part {
    text-align: center;
    flex: 1; /*flex item, każdy zajmuje tyle samo miejsca czyli 1*/
    display: flex; /*flex container dla el. p*/
    justify-content: center;
    flex-direction: column; /*ustawia w kolumnach flex-items czyli tutaj p*/
    transition: 
        font-size .7s,
        flex .7s;
}
.part.open {
    font-size: 2em;
    flex: 5; /*kiedy panel jest otwarty zajmuje 5*więcej miejsca niż panel zamkniety*/
}
.part p {
    width: 100%;
    flex: 1 0 auto;
    display: flex; /*flex container dla p*/
    justify-content: center;
    align-items: center;
    transition: transform .5s;
}
.part p:nth-child(2) {
    font-size: 2em;
    text-transform: uppercase;
}
.part p:first-child {
    transform: translateY(-100%); /*znikają górne napisy*/
}
.part.open-active p:first-child {
    transform: translateY(0); /*pojawiają się górne napisy*/
}
.part p:last-child {
    transform: translateY(100%); /*znikają dolne napisy*/
}
.part.open-active p:last-child {
    transform: translateY(0); /*pojawiają się dolne napisy*/
}
.part1 {
    background-color: #FF992C;
}
.part2 {
    background-color: #F27823;
}
.part3 {
    background-color: #F26320;
}
.part4 {
    background-color: #BF3E18;
}
.part5 {
    background-color: #8C1D0C;
}

@media screen and (max-width: 1000px) {
    body {
        font-size: 10px;
    }
    .part.open {
        font-size: 1.8em;
        flex: 3;
    }
    .part p:nth-child(2) {
        font-size: 2em;
    }
}
@media screen and (max-width: 530px) {
    body {
        font-size: 6px;
    }
}
!

JS 

              
                const parts = document.querySelectorAll('.part');

function toggleOpen() {
    this.classList.toggle('open');
}

function toggleActive(e) {
    if(e.propertyName.includes('flex')) {
        this.classList.toggle('open-active');
    }
}
parts.forEach(part => part.addEventListener('click', toggleOpen));
parts.forEach(part => part.addEventListener('transitionend', toggleActive));
!
999px

Console