CSS animation-play-state Property - Playground Example

<!DOCTYPE html><html><head><style type="text/css">/* Simple demo of animation-play-state using a checkbox toggle */
* {
    box-sizing: border-box;
}
body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f0f4f8;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}
.wrap {
    text-align: center;
}
/* hide the native checkbox */
input#pause {
    display: none;
}
/* styled label acts as the toggle button */
.toggle {
    display: inline-block;
    margin-bottom: 18px;
    padding: 10px 18px;
    background: #0366d6;
    color: #fff;
    border-radius: 8px;
    cursor: pointer;
    user-select: none;
    font-weight: 600;
    box-shadow: 0 6px 14px rgba(2,6,23,0.12);
}
/* change the label text based on checkbox state */
.toggle::after {
    content: "Pause";
}
input#pause:checked + .toggle::after {
    content: "Play";
}
/* the animated element */
.box {
    width: 120px;
    height: 120px;
    margin: 0 auto;
    border-radius: 14px;
    background: linear-gradient(135deg, #2dd4bf, #06b6d4);
    box-shadow: 0 12px 30px rgba(2,6,23,0.12);

    /* animation settings */
    animation: spin 1.8s linear infinite;
    animation-play-state: running; /* default state */
}
/* when the checkbox is checked, pause the animation */
input#pause:checked + .toggle + .box {
    animation-play-state: paused;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}
</style></head><body><div class="wrap">
    <input type="checkbox" id="pause">
    <label for="pause" class="toggle" aria-pressed="false"></label>
    <div class="box" aria-hidden="true"></div>
</div></body></html>