On my page, I'm displaying a log file in a div element with overflow-y:auto. In the top right corner of the div, I'm overlaying a close button div with position:relative.
When the scrollbar appears, the button is overlaying the scrollbar which is hard to see and looks ugly. You can see an example here: https://jsfiddle.net/4azw0rLf/
Moving it with javascript when scrollHeight exceeds clientHeight feels like a hack. Is there an option in CSS to move the close button to the left for the width of the scrollbar as soon as it appears?
You can wrap your terminal and move your close button inside. I created a minimal example starting from your code.
EDIT
With the first answer the close button scrolled along with the text, I corrected using the position: sticky; and top:0px;
It is not compatible with all browsers, but with most, you can check compatibility here.
const terminal = document.getElementById("terminal");
addText = () => {
terminal.innerHTML += "overflowing line<br>";
}#container-terminal {
position: relative;
overflow-y: auto;
border: 2px solid;
height: 100px;
width: 200px;
}
#terminal {
position: absolute;
height: 100%;
width: 100%;
}
#closeBtn {
background-color: red;
position: -webkit-sticky;
position: sticky;
top:0px;
width: 20px;
display: inline-block;
float: right;
}<div onclick="addText()" style="cursor:pointer;">Click to add text</div><br>
<div id="container-terminal">
<div id="terminal">CSS only<br>CSS only<br>CSS only<br>CSS only<br>CSS only<br></div>
<div id="closeBtn">X</div>
</div>