7.css/dist/gui/collapse.css

A design system for building faithful recreations of the Windows 7 UI.

details{margin-top:0}details>summary{cursor:pointer;display:inline;margin-bottom:0;position:relative}details>summary:before{border:5px solid transparent;border-left-color:#000;border-radius:3px;content:"";position:absolute;right:100%;top:calc(50% - 5px)}details[open]>summary:before{top:calc(50% - 2.5px);transform:rotate(45deg)}
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