Slider hiệu ứng cong

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HTML:

<div class="cont">
<div class="mouse"></div>
<div class="app">
<div class="app__bgimg">
<div class="app__bgimg-image app__bgimg-image--1">
</div>
<div class="app__bgimg-image app__bgimg-image--2">
</div>
</div>
<div class="app__img">
<img onmousedown="return false" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/537051/whiteTest4.png" alt="city" />
</div>

<div class="app__text app__text--1">
<div class="app__text-line app__text-line--4">imperdiet </div>
<div class="app__text-line app__text-line--3">ut le</div>
<div class="app__text-line app__text-line--2">non tincidunt </div>
<div class="app__text-line app__text-line--1"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/537051/opus-attachment.png" alt="" /></div>
</div>

<div class="app__text app__text--2">
<div class="app__text-line app__text-line--4">habitant</div>
<div class="app__text-line app__text-line--3">ut eget</div>
<div class="app__text-line app__text-line--2">Nam imperdiet</div>
<div class="app__text-line app__text-line--1"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/537051/opus-attachment.png" alt="" /></div>
</div>
</div>
<div class="pages">
<ul class='pages__list'>
<li data-target='1' class='pages__item pages__item--1 page__item-active'></li>
<li data-target='2' class='pages__item pages__item--2'></li>
</ul>
</div>
</div>
<a href="https://dribbble.com/shots/2936160-Opus-Animation" target="_blank" class="icon-link">
<img src="http://icons.iconarchive.com/icons/uiconstock/socialmedia/256/Dribbble-icon.png">
</a>
<a href="https://twitter.com/mrspok407" target="_blank" class="icon-link icon-link--twitter">
<img src="https://cdn1.iconfinder.com/data/icons/logotypes/32/twitter-128.png">
</a>




CSS:

html {
box-sizing: border-box;
}

*,
*:before,
*:after {
box-sizing: inherit;
margin: 0;
padding: 0;
}

$contBgClr: linear-gradient(to left bottom, #F2E3C6 0%, #A7A1A5 100%);
$appShadowClr: rgba(#000, .3);

.cont {
position: relative;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-image: $contBgClr;
overflow: hidden;
}

.app {
position: relative;
min-width: 850px;
height: 540px;
box-shadow: 0 0 60px $appShadowClr;
overflow: hidden;

&__bgimg {
position: absolute;
top: 0;
left: -2.5%;
width: 105%;
height: 100%;
transition: transform 3.5s 770ms;

&-image {
position: absolute;
width: 100%;
height: 100%;
top: 0;
left: 0;

&--1 {
background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/537051/city22222.jpg') center center no-repeat;
background-size: cover;
}

&--2 {
background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/537051/forest.jpg') center center no-repeat;
background-size: cover;
opacity: 0;
transition: opacity 0ms 1300ms;
will-change: opacity;
}
}
}

&__text {
position: absolute;
right: 165px;
top: 150px;
font-family: 'Roboto', sans-serif;
text-transform: uppercase;
z-index: 1;

&-line {
transition: transform 1500ms 400ms, opacity 750ms 500ms;
will-change: transform, opacity;
user-select: none;
@for $i from -4 through -1 {
&--#{abs($i)} {
transition: transform 1500ms 2000ms + 100ms * ($i - 1), opacity 1500ms 2750ms + 250ms * ($i - 1);
}
}
&--4 {
font: {
size: 50px;
weight: 700;
}
color: #0A101D;
}
&--3 {
font: {
size: 40px;
weight: 300;
}
}
&--2 {
margin-top: 10px;
font: {
size: 14px;
weight: 500;
}
color: #0099CC;
}
&--1 {
margin-top: 15px;
img {
width: 50px;
}
}
}

&--1 {

.app__text-line {
transform: translate3d(0, -125px, 0);
opacity: 0;
}
}

&--2 {
right: initial;
top: 250px;
left: 80px;
z-index: -1;
transition: z-index 1500ms;

@for $i from -4 through -1 {
.app__text-line--#{abs($i)} {
opacity: 0;
transition: transform 1500ms 300ms + 75ms * ($i - 1), opacity 400ms 500ms + 75ms *($i - 1);
}
}
}
}

&__img {
position: absolute;
transform: translate3d(0, -750px, 0);
width: 850px;
height: 100%;
transition: transform 3s cubic-bezier(0.6, 0.13, 0.31, 1.02);
will-change: transform;

img {
min-width: 100%;
user-select: none;
}
}
}

.initial {
.app__img {
transform: translate3d(0, 0, 0);
}
.app__text--1 {
@for $i from 1 through 4 {
.app__text-line--#{$i} {
transform: translate3d(0, 0, 0);
transition: transform 1500ms 1400ms + 75ms * ($i - 1), opacity 400ms 1600ms + 75ms *($i - 1);
opacity: 1;
}
}
}
}

.active {
.app__bgimg {
transform: translate3d(10px, 0, 0) scale(1.05);
transition: transform 5s 850ms ease-in-out;
.app__bgimg-image--2 {
opacity: 1;
transition: opacity 0ms 1500ms;
}
}
.app__img {
transition: transform 3s cubic-bezier(0.6, 0.13, 0.31, 1.02);
transform: translate3d(0, -1410px, 0);
}
.app__text--1 {
z-index: -1;
transition: z-index 0ms 1500ms;
@for $i from 1 through 4 {
.app__text-line--#{$i} {
transform: translate3d(0, -125px, 0);
transition: transform 1500ms 300ms + 75ms * ($i - 1), opacity 400ms 500ms + 75ms *($i - 1);
opacity: 0;
}
}
}
.app__text--2 {
z-index: 1;

@for $i from 1 through 4 {
.app__text-line--#{$i} {
transform: translate3d(0, -125px, 0);
transition: transform 2500ms 1100ms + 75ms * ($i - 1), opacity 1300ms 1300ms + 275ms *($i - 1);
opacity: 1;
}
}
}
}

.mouse {
position: relative;
margin-right: 20px;
min-width: 50px;
height: 80px;
border-radius: 30px;
border: 5px solid rgba(255, 255, 255, .Cool;
&:after {
content: '';
position: absolute;
top: 20px;
left: 50%;
transform: translate(-50%, 0);
width: 10px;
height: 10px;
border-radius: 50%;
background-color: #fff;
animation: scroll 1s infinite alternate;
@keyframes scroll {
100% {transform: translate(-50%, 15px)}
}
}
}

.pages {
margin-left: 20px;
&__list {
list-style-type: none;
}
&__item {
position: relative;
margin-bottom: 10px;
width: 30px;
height: 30px;
border-radius: 50%;
border: 3px solid #fff;
cursor: pointer;
&:after {
content: '';
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%) scale(0, 0);
width: 75%;
height: 75%;
border-radius: 50%;
background-color: #fff;
opacity: 0;
transition: 500ms;
}
&:hover:after {
transform: translate(-50%, -50%) scale(1, 1);
opacity: 1;
}
}
}

.page__item-active {
&:after {
transform: translate(-50%, -50%) scale(1, 1);
opacity: 1;
}
}

.icon-link {
position: absolute;
left: 5px;
bottom: 5px;
width: 50px;
img {
width: 100%;
vertical-align: top;
}
&--twitter {
left: auto;
right: 5px;
}
}



JS:


$(document).ready(function() {
const $app = $('.app');
const $img = $('.app__img');
const $pageNav1 = $('.pages__item--1');
const $pageNav2 = $('.pages__item--2');
let animation = true;
let curSlide = 1;
let scrolledUp, nextSlide;

let pagination = function(slide, target) {
animation = true;
if (target === undefined) {
nextSlide = scrolledUp ? slide - 1 : slide + 1;
} else {
nextSlide = target;
}

$('.pages__item--' + nextSlide).addClass('page__item-active');
$('.pages__item--' + slide).removeClass('page__item-active');

$app.toggleClass('active');
setTimeout(function() {
animation = false;
}, 3000)
}

let navigateDown = function() {
if (curSlide > 1) return;
scrolledUp = false;
pagination(curSlide);
curSlide++;
}

let navigateUp = function() {
if (curSlide === 1) return;
scrolledUp = true;
pagination(curSlide);
curSlide--;
}

setTimeout(function() {
$app.addClass('initial');
}, 1500);

setTimeout(function() {
animation = false;
}, 4500);

$(document).on('mousewheel DOMMouseScroll', function(e) {
var delta = e.originalEvent.wheelDelta;
if (animation) return;
if (delta > 0 || e.originalEvent.detail < 0) {
navigateUp();
} else {
navigateDown();
}
});

$(document).on("click", ".pages__item:not(.page__item-active)", function() {
if (animation) return;
let target = +$(this).attr('data-target');
pagination(curSlide, target);
curSlide = target;
});
});
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