CodePen Embed - CSS Scroll Snap Demo

Live

 
<div class="vertical-box">
    <div>
      <ul class="vertical snap">
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
        <li>7</li>
        <li>8</li>
        <li>9</li>
        <li>10</li>
        <li>11</li>
        <li>12</li>
        <li>13</li>
        <li>14</li>
        <li>15</li>
        <li>16</li>
      </ul>
    </div>
</div>

Live

​x
 
​
html,
body {
    width: 100%;
    height: 100%;
}
body {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2vmax;
    box-sizing: border-box;
}
​
.horizontal-box,
.vertical-box {
    display: flex;
    flex-direction: row;
    width: 700px;
    justify-content: space-between;
}
​
ul {
    border: 1px solid black;
    font-size: 0;
    height: 300px;
    position: relative;
    width: 620px;
    display: flex;
    flex-wrap: wrap;
    flex-direction: row;
    justify-content: space-between;
}
​
li {
    width: 200px;
    font-size: 5rem;
    line-height: 200px;
    text-align: center;
    scroll-snap-align: start;
    //scroll-margin-top: 20px;
    background: #cba;
    margin-bottom: 30px;
}
​
.snap {
    overflow-x: auto;
    scroll-snap-type: y mandatory;
    // scroll-padding-top: 30px;
}
​
​

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