Menu tutup buka (Spoiler) dengan Scroll

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<div style="margin: 5px;">
<div class="bigfont" style="margin-bottom: 2px;">
<input onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = ''; this.innerText = ''; this.value = 'Close'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'Open'; }" style="margin: 0px; padding: 0px; width: 60px;" type="button" value="Open" /></div>
<div class="alt2" style="-moz-border-radius: 10px 10px 10px 10px; -moz-box-shadow: 2px 2px 4px rgb(139, 210, 104); background: url(&quot;https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-BNmIKxCU65MpNcoAR7y0DulM8L9IIJKpQICO3kChiYsXH2Vjq1df6kxvLNIti9RcyRlaBWYfSsmEx5Tyxrcad_J7apA4Mt25iqY_22eF63iLQ5SUj5etFvxiRm_4VEH8LCys-5lSld9H/s1600/papers.jpg&quot;) no-repeat scroll 0% 0% transparent; border: 1px inset; color: black; margin: 0px; padding: 6px;">
<div style="display: none; height: 100px; overflow: auto; padding: 10px; width: auto;">

Contoh

</div>
</div>
</div>