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<!DOCTYPE html>
<html>
<body>
<style>
.scroller {
overflow: scroll;
width: 350px;
height: 350px;
border: solid 1px black;
scroll-snap-type: y mandatory;
position: relative;
resize: both;
}
.large-space {
height: 300vh;
width: 300vw;
position: absolute;
}
.snap {
scroll-snap-align: start;
}
.box {
width: 100px;
height: 100px;
background-color: green;
display: inline-block;
position: relative;
}
.grid {
position: absolute;
width: 350px;
height: 350px;
}
.snap:target {
background-color: blue;
}
</style>
<div class="scroller" id="scroller">
<div class="large-space"></div>
<div class="grid" id="grid">
<div id="box1" class="snap box">Box 1</div>
<div id="box2" class="snap box">Box 2</div>
<div id="box3" class="snap box">Box 3</div>
<div id="box4" class="snap box">Box 4</div>
<div id="box5" class="snap box">Box 5</div>
<div id="box6" class="snap box">Box 6</div>
<div id="box7" class="snap box">Box 7</div>
<div id="box8" class="snap box">Box 8</div>
<div id="box9" class="snap box">Box 9</div>
</div>
</div>
</body>
</html>