Modals can be used as an alternative to banner notices. Because modals get displayed on top of existing page content, they do not cause layout shifts when they are displayed. This modal grows in size to fit its contents.
HTML
<div id="modal" class="modal">
<button id="close-button" class="close-button" aria-label="close" tabindex="0">✕</button>
<div>
<h1>Notice</h1>
Lorem ipsum dolor sit amet.
</div>
</div>CSS
body {
overscroll-behavior-y: none;
font-family: system-ui;
padding: 2em;
background-color: #f4f4f4;
}
.modal {
position: fixed;
top: 50%;
left: 50%;
min-width: 66%;
transform: translate(-50%, -50%);
padding: 1em 2em 2em 2em;
background-color: white;
box-shadow: 0 0 15px rgba(0,0,0,0.2);
}
.close-button {
background: transparent;
border: none;
padding: 1em;
font-size: 1em;
position: absolute;
right: 0;
top: 0;
cursor: pointer;
}
JS
document.getElementById("close-button").onclick = () => {
document.getElementById("modal").style.display = "none";
}