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<!DOCTYPE html>
<html>
<body>
<style>
* {
margin: 0px;
}
.scroller {
height: 500px;
width: 80vw;
border: solid 1px;
overflow-x: scroll;
justify-self: center;
white-space: nowrap;
padding-top: 50px;
scroll-behavior: smooth;
scroll-snap-type: x mandatory;
counter-set: markeridx -1;
}
.scroll-marker-group {
border: solid 1px black;
height: 40px;
width: 500px;
display: grid;
grid-auto-flow: column;
justify-self: center;
overflow-x: scroll;
white-space: nowrap;
scroll-snap-type: x mandatory;
}
.box {
height: 400px;
width: 50%;
border: 1px solid;
display: inline-block;
margin-left: 100px;
margin-right: 100px;
scroll-snap-align: none;
align-content: center;
text-align: center;
&::scroll-marker:target-current {
background-color: green;
}
}
.scroll-marker {
content: counter(markeridx);
counter-increment: markeridx;
width: 20px;
height: 20px;
background-color: red;
text-align: center;
margin-right: 100px;
}
#box3 {
scroll-snap-align: center;
}
#marker3 {
scroll-snap-align: center;
}
.green {
background-color: green
}
</style>
<div class="scroller" id="carousel">
<div class="box" id="box0"><p>0</p></div>
<div class="box" id="box1"><p>1</p></div>
<div class="box" id="box2"><p>2</p></div>
<div class="box" id="box3"><p>3</p></div>
<div class="box" id="box4"><p>4</p></div>
<div class="box" id="box5"><p>5</p></div>
<div class="box" id="box6"><p>6</p></div>
<div class="box" id="box7"><p>7</p></div>
<div class="box" id="box8"><p>8</p></div>
<div class="box" id="box9"><p>9</p></div>
<div class="box" id="box10"><p>10</p></div>
<div class="box" id="box11"><p>11</p></div>
<div class="box" id="box12"><p>12</p></div>
<div class="box" id="box13"><p>13</p></div>
<div class="box" id="box14"><p>14</p></div>
<div class="box" id="box15"><p>15</p></div>
</div>
<div class="scroll-marker-group" id="marker-group">
<div class="scroll-marker" id="marker0"><a href="#">0</a></div>
<div class="scroll-marker" id="marker1"><a href="#">1</a></div>
<div class="scroll-marker" id="marker2"><a href="#">2</a></div>
<div class="green scroll-marker" id="marker3"><a href="#">3</a></div>
<div class="scroll-marker" id="marker4"><a href="#">4</a></div>
<div class="scroll-marker" id="marker5"><a href="#">5</a></div>
<div class="scroll-marker" id="marker6"><a href="#">6</a></div>
<div class="scroll-marker" id="marker7"><a href="#">7</a></div>
<div class="scroll-marker" id="marker8"><a href="#">8</a></div>
<div class="scroll-marker" id="marker9"><a href="#">9</a></div>
<div class="scroll-marker" id="marker10"><a href="#">10</a></div>
<div class="scroll-marker" id="marker11"><a href="#">11</a></div>
<div class="scroll-marker" id="marker12"><a href="#">12</a></div>
<div class="scroll-marker" id="marker13"><a href="#">13</a></div>
<div class="scroll-marker" id="marker14"><a href="#">14</a></div>
<div class="scroll-marker" id="marker15"><a href="#">15</a></div>
</div>
</body>
</html>
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