'Triple color gradient

I'm trying to get a color gradient like this picture :

enter image description here

enter image description here

I tried to deal with this via this description, I think I need a deep understanding about the Offset feature

  <LinearGradientBrush x:Key="GradientCard1" StartPoint="0,0" EndPoint="10,10">
       <GradientStop Offset="0.10" Color="#00FFA3" />
       <GradientStop Offset="10.10" Color="#03E1FF" />
       <GradientStop Offset="0.2" Color="#101921" />
  </LinearGradientBrush>


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