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与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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That is not valid standard CSS, but it's an example of nesting class declarations using Sass/SCSS or LESS and I believe other CSS extensions out there, which expand it to something like this (which is valid CSS), before serving it to the browser to use:

div.a {
  color: red;
}

div.a div.b {
  /* Inherits color from div.a */
  font-weight: bold;
}

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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