title: How to add a label over slider selector
body: <p>How can I get a little label telling me what number I have selected on a slider in Dash for python? I am using dash_core_components.Slider().</p>
  
  <p>I essentially want to have something with the little blue "500" label shown on the first slider <a href="https://shiny.rstudio.com/articles/sliders.html" rel="nofollow noreferrer">here</a>.</p>