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HTML 

              
                <div class="container">
  <!--Stylish FAQ Accordion by Informatology--> 
        <label class="accordion accordion--1" for="open-1">
            <input class="accordion__open" id="open-1" type="radio" name="acoordion-1">
            <input class="accordion__close" id="close-1" type="radio" name="acoordion-1">
            <div class="accordion__tab">FAQ</div>
            <div class="accordion__wrapper">
                <dl class="accordion__box">
                    <dt class="accordion__patition">
                        <span class="accordion__number">01</span>
                        <span class="accordion__title">FAQ item title</span>
                    </dt>
                    <dd class="accordion__text">
                    <ul>
                        <li>Subscribe</li>
                        <li>Like</li>
                        <li>Comment</li>
                        <p>If it was helpful, I will really appreciate if you support this channel!</p>
                    </ul>
                    </dd>
                </dl>
            </div>
            <label for="close-1" class="accordion__button">
                <span class="accordion__buttonText">CLOSE</span>
            </label>
        </label>
    </div>
!

CSS 

              
                .accordion--1{
    --color : #ff2e71 ;
}
.accordion{
    position : relative ;
    width : 300px ;
    color : #443849 ;
}
.accordion__tab{
    display : flex ;
    align-items : flex-end ;
    justify-content : center ;
    position : relative ;
    z-index : 2 ;
    width : 96px ;
    height : 24px ;
    font-size : 16px ;
    border-radius : 12px 13px 0 0 ;
    background : #fff ;
}
.accordion__tab::before{
    content : '' ;
    position : absolute ;
    z-index : 2 ;
    bottom : 0 ;
    right : -16px ;
    width : 0 ;
    height : 0 ;
    border-top : solid 20px transparent ;
    border-left : solid 20px #fff ;
    border-right : solid 0 transparent ;
    border-bottom : solid 0 transparent ;
}
.accordion__open,
.accordion__close{
    display : none ;
}
.accordion__wrapper{
    position : relative ;
    width : 100% ;
    height : 100% ;
    padding :  24px ;
    box-sizing : border-box ;
    background : #fff ;
    border-radius : 0 12px 12px 12px ;
    cursor : pointer ;
}
.accordion__box{
    margin : 0 ;
}
.accordion__patition{
    position : relative ;
    z-index : 2 ;
    box-sizing : border-box ;
    width : 100% ; 
    transition : all .2s ease ;
}
.accordion__number{
    position : absolute ;
    top : 0 ;
    left : 0 ;
    display : flex ;
    align-items : center ;
    width : 50px ;
    height : 40px ;
    margin-right : 16px ;
    font-size : 40px ;
    font-family: 'Barlow', sans-serif;
    color : var(--color) ;
}
.accordion__number::before{
    content : '' ;
    position : absolute ;
    bottom : 4px ;
    left : 72px ;
    width : 0 ;
    height : 40px ;
    background : var(--color) ;
}
.accordion__number::after{
    content : 'Frequently Asked Questions' ;
    position : absolute ;
    bottom : 4px ;
    left : 88px ;
    width : 0 ;
    height : 40px ;
    font-size : 13px ;
    line-height : 13px ;
    overflow : hidden ;
}
.accordion__title{
    display : flex ;
    align-items : center ;
    box-sizing : border-box ;
    padding-left : 56px ;
    font-size : 16px ;
    font-weight : bold ;
    line-height : 1.3 ;
    min-height : 40px ;
}
.accordion__title::before{
    content : '' ;
    position : absolute ;
    bottom : -12px ;
    right : 0 ;
    width : 0 ;
    height : 1px ;
    background : var(--color) ;
}
.accordion__text{
    position : relative ;
    z-index : 2 ;
    margin : 0 ;
    font-size : 14px ;
    line-height : 1.6 ;
    max-height : 0 ;
    overflow : hidden ;
    color : transparent ;
    transition : all .5s ease ;
}
.accordion__text::before{
    content : '' ;
    position : absolute ;
    top : 0 ;
    left : 0 ;
    right : auto ;
    width : 0 ;
    height : 100% ;
    background : var(--color) ;
}
.accordion__button{
    position : absolute ;
    z-index : 1 ;
    top : 4px ;
    left : 4px ;
    font-family: 'Barlow', sans-serif;
    font-size : 14px ;
    width : 0 ;
    height : 28px ;
    overflow : hidden ;
    transition : all .5s ease ;
    cursor : pointer ;
}
.accordion__button::before{
    content : '' ;
    position : absolute ;
    z-index : 1 ;
    bottom : 0 ;
    right : 0 ;
    width : 100% ;
    height : 100% ;
    transform-origin : bottom right ;
    transform : skew(30deg) ;
    border-radius : 0 6px 0 0 ;
    background : var(--color) ;
}
.accordion__buttonText{
    display : flex ;
    align-items : center ;
    justify-content : flex-end ;
    position : absolute ;
    z-index : 3 ;
    top : 0 ;
    left : 0 ;
    width : 100% ;
    height : 100% ;
    box-sizing : border-box ;
    padding-right : 40px ;
    color : #fff ;
}
.accordion__buttonText::before,
.accordion__buttonText::after{
    content : '' ;
    position : absolute ;
    top : 0 ;
    right : 24px ;
    bottom : 0 ;
    margin : auto 0 ;
    width : 12px ;
    height : 3px ;
    background : #fff ;
}
.accordion__buttonText::before{
    transform : rotate(45deg) ;
}
.accordion__buttonText::after{
    transform : rotate(-45deg) ;
}
.accordion__open:checked ~ .accordion__tab{
    animation : tab_height .3s ease ;
    animation-fill-mode : forwards ;
}
@keyframes tab_height{
    0%  { 
        height : 24px ;
        color : #443849 ;
    }
    100%{ 
        height : 32px ;
        color : var(--color) ;
    }
}
.accordion__close:checked ~ .accordion__tab{
    height : 32px ;
    animation : tab_height_rev .3s .3s ease ;
    animation-fill-mode : forwards ;
    color : var(--color) ;
}
@keyframes tab_height_rev{
    0%  { 
        height : 32px ;
        color : var(--color) ;
    }
    100%{ 
        height : 24px ;
        color : #443849 ;
    }
}
.accordion__open:checked ~ .accordion__tab::before{
    animation : tab_triangle .3s ease ;
    animation-fill-mode : forwards ;
}
@keyframes tab_triangle{
    0%  { 
        right : -16px ;
        border-top : solid 20px transparent ;
    }
    100%{ 
        right : -18px ;
        border-top : solid 26px transparent ;
    }
}
.accordion__close:checked ~ .accordion__tab::before{
    right : -18px ;
    border-top : solid 26px transparent ;
    animation : tab_triangle_rev .3s .3s ease ;
    animation-fill-mode : forwards ;
}
@keyframes tab_triangle_rev{
    0%  { 
        right : -18px ;
        border-top : solid 26px transparent ;
    }
    100%{ 
        right : -16px ;
        border-top : solid 20px transparent ;
    }
}
.accordion__open:checked ~ .accordion__wrapper{
    cursor : default ;
}
.accordion__open:checked ~ .accordion__wrapper .accordion__patition{
    margin-bottom : 24px ;
    animation : title_top .3s ease ;
    animation-fill-mode : forwards ;
}
@keyframes title_top{
    0%  { 
        padding-top : 0 ;
        margin-bottom : 0 ;
    }
    100%{ 
        padding-top : 64px ;
        margin-bottom : 24px ;        
    }
}
.accordion__close:checked ~ .accordion__wrapper .accordion__patition{
    padding-top : 64px ;
    margin-bottom : 24px ;
    animation : title_top_rev .3s .5s ease ;
    animation-fill-mode : forwards ;
}
@keyframes title_top_rev{
    0%  { 
        padding-top : 64px ;
        margin-bottom : 24px ;        
    }
    100%{ 
        padding-top : 0 ;
        margin-bottom : 0 ;
    }
}
.accordion__open:checked ~ .accordion__wrapper .accordion__number{
    animation : rotate 1s linear ;
    animation-fill-mode : forwards ;
}
@keyframes rotate{
    0%  { 
        transform : rotateY(0deg) scale(1);
        width : auto ;
    }
    20% { 
        transform : rotateY(360deg) scale(1.6);
        font-size : 56px ;
        height : 56px ;
    }
    60% { 
        transform : rotateY(360deg) scale(1.6);

    }
    70% { 
        transform : rotateY(360deg) scale(1);
        width : auto ;
    }
    84% { 
        transform : rotateY(360deg) scale(1);
        width : auto ;
    }
    85% { 
        transform : rotateY(360deg) scale(1);
        width : 100% ;
    }
    100%{ 
        transform : rotateY(360deg) scale(1);
        width : 100% ;
        font-size : 56px ;
        height : 56px ;
    }
}
.accordion__close:checked ~ .accordion__wrapper .accordion__number{
    font-size : 56px ;
    height : 56px ;
    animation : rotate_rev .2s .5s linear ;
    animation-fill-mode : forwards ;
}
@keyframes rotate_rev{
    0%  { 
        font-size : 56px ;
        height : 56px ;
    }
    100%{ 
        font-size : 40px ;
        height : 40px ;
    }
}
.accordion__open:checked ~ .accordion__wrapper .accordion__number::before{
    animation : num_line .3s .9s ease ;
    animation-fill-mode : forwards ;
}
@keyframes num_line{
    0%  { 
        width : 0 ;
    }
    100%{ 
        width : 5px ;
    }
}
.accordion__close:checked ~ .accordion__wrapper .accordion__number::before{
    animation : num_line_rev .3s ease ;
    animation-fill-mode : forwards ;
}
@keyframes num_line_rev{
    0%  { 
        width : 5px ;
    }
    100%{ 
        
        width : 0 ;
    }
}
.accordion__open:checked ~ .accordion__wrapper .accordion__number::after{
    animation : num_text .7s 1s ease ;
    animation-fill-mode : forwards ;
}
@keyframes num_text{
    0%  { 
        width : 0 ;
    }
    100%{ 
        width : 80px ;
    }
}
.accordion__close:checked ~ .accordion__wrapper .accordion__number::after{
    animation : num_text_rev .3s ease ;
    animation-fill-mode : forwards ;
}
@keyframes num_text_rev{
    0%  {
        width : 80px ;
    }
    100%{ 
        width : 0 ;
    }
}
.accordion__open:checked ~ .accordion__wrapper .accordion__title{
    animation : title_space .5s .9s ease ;
    animation-fill-mode : forwards ;
}
@keyframes title_space{
    0%  { 
        padding-left : 56px ;
    }
    100%{ 
        padding-left : 0 ;
    }
}
.accordion__close:checked ~ .accordion__wrapper .accordion__title{
    padding-left : 0 ;
    animation : title_space_rev .3s .3s ease ;
    animation-fill-mode : forwards ;
}
@keyframes title_space_rev{
    0%  { 
        padding-left : 0 ;
        
    }
    100%{ 
        padding-left : 56px ;
    }
}
.accordion__open:checked ~ .accordion__wrapper .accordion__title::before{
    animation : title_line .5s .9s ease ;
    animation-fill-mode : forwards ;
}
@keyframes title_line{
    0%  { 
        width : 0 ;
    }
    100%{ 
        width : 100% ;
    }
}
.accordion__close:checked ~ .accordion__wrapper .accordion__title::before{
    animation : title_line_rev .3s ease ;
    animation-fill-mode : forwards ;
}
@keyframes title_line_rev{
    0%  { 
        width : 100% ;
    }
    100%{ 
        width : 0 ;
    }
}

.accordion__open:checked ~ .accordion__wrapper .accordion__text{
    max-height : 200px ;
    animation : text_color .8s .9s ease ;
    animation-fill-mode : forwards ;
}
@keyframes text_color{
    0%   {
        color : transparent ;
    }
    49.9%{
        color : transparent ;
    }
    50%  {
        color : #443849 ;
    }
    100% {
        color : #443849 ;
    }
}
.accordion__close:checked ~ .accordion__wrapper .accordion__text{
    animation : text_color_rev .3s ease ;
    animation-fill-mode : forwards ;
}
@keyframes text_color_rev{
    0%   {
        color : #443849 ;
    }
    100% {
        color : transparent ;
    }
}
.accordion__open:checked ~ .accordion__wrapper .accordion__text::before{
    animation : text_blind .8s .9s ease ;
    animation-fill-mode : forwards ;
}
@keyframes text_blind{
    0%   {
        width : 0 ;
        left : 0 ;
        right : auto ;
    }
    45% {
        width : 100% ;
        left : 0 ;
        right : auto ;
    }
    49.9%{
        width : 100% ;
        left : 0 ;
        right : auto ;
    }
    50%  {
        width : 100% ;
        left : auto ;
        right : 0 ;
    }
    55%  {
        width : 100% ;
        left : auto ;
        right : 0 ;
    }
    100% {
        width : 0 ;
        left : auto ;
        right : 0 ;
    }
}
.accordion__open:checked ~  .accordion__button{
    animation : close_button .5s .9s ease-out ;
    animation-fill-mode : forwards ;
}
@keyframes close_button{
    0%  { 
        width : 0 ;
    }
    100%{ 
        width : calc(100% - 24px - 4px) ;
    }
}
.accordion__close:checked ~  .accordion__button{
    animation : close_button_rev .3s ease-in ;
    animation-fill-mode : forwards ;
}
@keyframes close_button_rev{
    0%  { 
        width : calc(100% - 24px - 4px) ;
    }
    100%{ 
        width : 0 ;
    }
}


.container{
    position : relative ;
    width : 100% ;
    height : 500px ;
    display : flex ;
    justify-content : space-around ;
    align-items : flex-start ;
    background : #222 ;
  padding-top: 20px;
  font-family: Arial;
}
!

JS
!
999px

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