<button popovertarget="tuts-popover" class="trigger-btn">Open Popover</button>

<div id="tuts-popover" popover=manual>
  <button class="close-btn" popovertarget="tuts-popover" popovertargetaction="hide">
    <div aria-hidden="true">
        <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><title>x-mark</title><g fill="none"><path d="M6 18L18 6M6 6l12 12" stroke="#0F172A" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"></path></g></svg>
    </div>
    <span class="sr-only">Close</span>
  </button>
  <p>I am a popover with more information.<p>
</div>

.trigger-btn {
  padding: 0.8rem 1.6rem;
  background: #2563eb;
  color: white;
  font-weight: 500;
  border-radius: 6px;
  border: none;
  font-size: 1rem;
}

.trigger-btn:hover {
  background: #1d4ed8;
}

.close-btn {
  border: none;
  background: transparent;
  position: absolute;
  right: 0.5rem;
  top: 0.5rem;
  padding: 0;
  margin: 0;
  border-radius: 4px;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  
}

.close-btn:hover {
  background: rgba(0, 0, 0, .1);
}

#tuts-popover::backdrop {
  background: rgba(0, 0, 0, .2);  
}

#tuts-popover {
  background: white;
  color: #333;
  font-weight: 400;
  padding: 2rem;
  max-width: 600px;
  width: 440px;
  line-height: 1.4;
  position: absolute;
  top: 6rem;
  left: 0;
  right: 0;
  margin: 0 auto;
  padding-top: 2rem;
  border-radius: 16px;
  box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  border: 1px solid #64748b;

}

body {
  display: grid;
  font-family: system-ui, sans-serif;
  place-items: center;
  height: 100dvh;
}

.sr-only:not(:focus):not(:active) {
  clip: rect(0 0 0 0); 
  clip-path: inset(50%);
  height: 1px;
  overflow: hidden;
  position: absolute;
  white-space: nowrap; 
  width: 1px;
}