给激活窗口加边框
/* ! 模仿Colorful Note Borders插件，针对激活的窗口进行添加边框*/
.markdown-preview-view:focus,
.view-content
> .markdown-source-view.mod-cm6
> .cm-editor
> .cm-scroller,
.markdown-preview-view {
border: 4px solid rgba(255, 0, 0, 0);
}
.markdown-preview-view:focus {
border: 4px solid rgba(255, 0, 0, 0.455);
}
.markdown-preview-view:focus,
.view-content
> .markdown-source-view.mod-cm6
> .cm-editor
> .cm-scroller:focus-within {
border: 4px solid rgba(255, 0, 0, 0.455);
}
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