Here's a link to my codepen: https://codepen.io/Bryandbronstein/pen/NLVQjB
So this is a strange issue and I'm at the end of my rope with this one. I've been learning a bit more about CSS and Javascript, and decided to try out an image comparison slider I found on W3C's website. It works perfectly as a single element, however I want to have a full gallery of these. Yet no matter what I try, they don't seem to want to obey any of the flex rules I set for their parent container. You'll notice in the codepen that one comparison container is hidden behind another. Any ideas?
function initComparisons() {
var x, i;
/*find all elements with an "overlay" class:*/
x = document.getElementsByClassName("img-comp-overlay");
for (i = 0; i < x.length; i++) {
/*once for each "overlay" element:
pass the "overlay" element as a parameter when executing the compareImages function:*/
compareImages(x[i]);
}
function compareImages(img) {
var slider, img, clicked = 0, w, h;
/*get the width and height of the img element*/
w = img.offsetWidth;
h = img.offsetHeight;
/*set the width of the img element to 50%:*/
img.style.width = (w / 2) + "px";
/*create slider:*/
slider = document.createElement("DIV");
slider.setAttribute("class", "img-comp-slider");
/*insert slider*/
img.parentElement.insertBefore(slider, img);
/*position the slider in the middle:*/
slider.style.top = (h / 2) - (slider.offsetHeight / 2) + "px";
slider.style.left = (w / 2) - (slider.offsetWidth / 2) + "px";
/*execute a function when the mouse button is pressed:*/
slider.addEventListener("mousedown", slideReady);
/*and another function when the mouse button is released:*/
window.addEventListener("mouseup", slideFinish);
/*or touched (for touch screens:*/
slider.addEventListener("touchstart", slideReady);
/*and released (for touch screens:*/
window.addEventListener("touchstop", slideFinish);
function slideReady(e) {
/*prevent any other actions that may occur when moving over the image:*/
e.preventDefault();
/*the slider is now clicked and ready to move:*/
clicked = 1;
slider.style.border = "0";
/*execute a function when the slider is moved:*/
window.addEventListener("mousemove", slideMove);
window.addEventListener("touchmove", slideMove);
}
function slideFinish() {
/*the slider is no longer clicked:*/
clicked = 0;
slider.style.border = "3px solid white";
}
function slideMove(e) {
var pos;
/*if the slider is no longer clicked, exit this function:*/
if (clicked == 0) return false;
/*get the cursor's x position:*/
pos = getCursorPos(e)
/*prevent the slider from being positioned outside the image:*/
if (pos < 0) pos = 0;
if (pos > w) pos = w;
/*execute a function that will resize the overlay image according to the cursor:*/
slide(pos);
}
function getCursorPos(e) {
var a, x = 0;
e = e || window.event;
/*get the x positions of the image:*/
a = img.getBoundingClientRect();
/*calculate the cursor's x coordinate, relative to the image:*/
x = e.pageX - a.left;
/*consider any page scrolling:*/
x = x - window.pageXOffset;
return x;
}
function slide(x) {
/*resize the image:*/
img.style.width = x + "px";
/*position the slider:*/
slider.style.left = img.offsetWidth - (slider.offsetWidth / 2) + "px";
}
}
} html, body {
background-color: #333333;
margin: 0;
padding: 0;
}
* {box-sizing: border-box;}
.gallery_text {
color: white;
font-family: Abel, Helvetica, sans-serif;
font-size: 1.7rem;
text-align: center;
line-height: 1.8em;
}
.row{
display: flex;
flex-wrap: wrap;
justify-content: center;
align-items: center;
}
.img-comp-container{
position: relative;
flex: 50%;
}
.img-comp-overlay{
border-right: 2px solid rgba(51,51,51, .5) ;
}
.img-comp-img {
position: absolute;
width: auto;
height: auto;
overflow: hidden;
}
.img-comp-img img {
vertical-align: middle;
}
.img-comp-slider {
position: absolute;
z-index: 9;
cursor: ew-resize;
width: 40px;
height: 40px;
transform: rotate(136deg);
background-color: #333333;
opacity: .8;
border-radius: 10%;
border: 3px solid white;
} <body onload="initComparisons();">
<div class="row">
<div class="img-comp-container" >
<div class="img-comp-img">
<img src="https://images.pexels.com/photos/162389/lost-places-old-decay-ruin-162389.jpeg?cs=srgb&dl=black-and-white-dark-building-162389.jpg&fm=jpg" width="500" height="450">
</div>
<div class="seperator"></div>
<div class="img-comp-img img-comp-overlay">
<img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSslfAcWKXuMxBpzcJC5ZUyFqMOb2Jtd12x4kBUGG9mTe3KeMJz" width="500" height="450">
</div>
</div>
<div class="img-comp-container">
<div class="img-comp-img">
<img src="https://images.pexels.com/photos/162389/lost-places-old-decay-ruin-162389.jpeg?cs=srgb&dl=black-and-white-dark-building-162389.jpg&fm=jpg" width="500" height="450">
</div>
<div class="seperator"></div>
<div class="img-comp-img img-comp-overlay">
<img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSslfAcWKXuMxBpzcJC5ZUyFqMOb2Jtd12x4kBUGG9mTe3KeMJz" width="500" height="450">
</div>
</div>
<div class="img-comp-container">
<div class="img-comp-img">
<img src="https://images.pexels.com/photos/162389/lost-places-old-decay-ruin-162389.jpeg?cs=srgb&dl=black-and-white-dark-building-162389.jpg&fm=jpg" width="500" height="450">
</div>
<div class="seperator"></div>
<div class="img-comp-img img-comp-overlay">
<img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSslfAcWKXuMxBpzcJC5ZUyFqMOb2Jtd12x4kBUGG9mTe3KeMJz" width="500" height="450">
</div>
</div>
</div>
</body>The images won't wrap because all children of .img-comp-container were absolutely positioned. This collapsed all the flex elements so that the flex wrap wouldn't work.
Either make one of more of the children of .img-comp-container relative or static, or set a width and height to .img-comp-container.
Here are the changes I made to the CSS:
.img-comp-container{
position: relative;
flex: 50%;
}
.img-comp-img {
position: relative;
width: auto;
height: auto;
overflow: hidden;
}
.img-comp-overlay {
border-right: 2px solid rgba(51, 51, 51, 0.5);
position: absolute;
top: 0;
left: 0;
}
See this codepen fork of your pen for a working solution.