.cm-history-sec .img_previewer{max-height:488px;overflow:hidden;position:relative}.cm-history-sec .img_previewer:after{background:linear-gradient(180deg,hsla(0,0%,100%,0),#fff);bottom:0;content:"";height:40px;left:0;pointer-events:none;position:absolute;transition:opacity .3s ease;width:100%}.cm-history-sec .toggle-summary{cursor:pointer;padding:8px 8px 8px 32px;position:relative;user-select:none}.cm-history-sec .toggle-summary:before{border-bottom:6px solid transparent;border-left:8px solid #333;border-top:6px solid transparent;content:"";height:0;left:10px;position:absolute;top:50%;transform:translateY(-50%) rotate(0deg);transition:transform .3s ease;width:0}.cm-history-sec .expandable_group.showimg .img_previewer{max-height:none}.cm-history-sec .expandable_group.showimg .img_previewer:after{opacity:0}.cm-history-sec .expandable_group.showimg .toggle-summary:before{transform:translateY(-50%) rotate(-90deg)}