Overflow scroll without hiding it's overflowing content

Question

I am trying to create a 'slider' where a user is able to scroll horizontally to navigate to certain 'slider items'. I'm trying to create this with pure css, however; I can't seem to get it working right.

Start:

End:

Alright, let me explain the pictures a little. Everything within 'Window' is visible. That means also the overflow from the unordered list. What I want is to make the user able to scroll horizontally within the container to move the unordered list. However; I can't use overflow: hidden or overflow: scroll on the 'container' since it will hide all the overflowing content, which I do not want.

How can I achieve this or is it even possible to achieve with pure CSS?

My current code: https://jsfiddle.net/f0exzxkw/2/

Answer 1

I started using the SwiperJs as @Karl mentioned (demo: https://swiper-demo-13-centered-1j4bnx.stackblitz.io/), but after that i started try without it. There is a lot of tricks, and a lot of them can be different and be improved. But, to align correctly the scrollbar, you have to use a custom one. The main idea was have a negative margin on .scroll-container, using CSS Variables to calculate the space scross the elements.

:root {
    --WINDOW-X-SPACE: 20px;
    --CONTAINER-X-SPACE: 30px;
}

* {
    box-sizing: border-box;
}
html, body {
    height: 100vh;
}
body {
    background: teal;
    margin: 0;
    padding: 20px var(--WINDOW-X-SPACE);
    overflow-x: hidden;
}
main {
    padding: 10px var(--CONTAINER-X-SPACE);
    background: purple;
}
.scroll-container {
    height: 200px;
    margin: 0 calc(-1 * calc(var(--WINDOW-X-SPACE) + var(--CONTAINER-X-SPACE)));
    padding: 0 var(--WINDOW-X-SPACE);
    display: flex;
    overflow: auto;
}
.scroll-container::-webkit-scrollbar {
    all: unset;
}
 
.scroll-container::-webkit-scrollbar-track {
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3); 
    border-radius: 10px;
    margin: 0 var(--WINDOW-X-SPACE);
}
 
.scroll-container::-webkit-scrollbar-thumb {
    border-radius: 10px;
    -webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.5); 
    background-color: white;
}
.list-wrapper {
    background: orange;
    width: fit-content;
    height: 100%;
    display: flex;
    margin: 0;
    padding: 0;
    padding-top: 40px;
    position: relative;
}
.list-wrapper:before {
    content: "Unordened list";
    display: block;
    position: absolute;
    left: 15px;
    top: 12px;
}
.list-item {
    text-align: center;
    font-size: 18px;
    background: rgba(255, 255, 255, .5);
    border: solid 1px orange;
    width: 100px;
    flex-shrink: 0;
    height: 100%;

    /* Center slide text vertically */
    display: flex;
    justify-content: center;
    align-items: center;
}

.fix-offset {
    width: var(--WINDOW-X-SPACE);
    flex-shrink: 0;
}

<h4>Window</h4>
<main>
    <h4>Container</h4>
    <div class="scroll-container">
        <ul class="list-wrapper">
            <div class="list-item">List item</div>
            <div class="list-item">List item</div>
            <div class="list-item">List item</div>
            <div class="list-item">List item</div>
            <div class="list-item">List item</div>
            <div class="list-item">List item</div>
            <div class="list-item">List item</div>
            <div class="list-item">List item</div>
            <div class="list-item">List item</div>
            <div class="list-item">List item</div>
        </ul>
        <span class="fix-offset"></span>
    </div>
</main>

Try it: https://codepen.io/Alynva/full/gOPaGVX