title: How to achieve Steam-like window using winapi?
body: <p><img src="https://i.stack.imgur.com/UKH2x.png" alt="Steam window">
  This is a screenshot of Steam's client window being resized.</p>
  
  <p>Steam's client window has two cool features.</p>
  
  <ol>
  <li>Custom window which is very responsive.</li>
  <li>Cool glass resize effect, different from standard windows (Thought it might be a side effect strongly related to 1)</li>
  </ol>
  
  <p>Let's say I wanna create similar window using winapi. How can I do it?</p>
  
  <p>I don't ask about widget-management related stuff, but about technical winapi tricks.</p>