2 added 921 characters in body
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Why not just use the graphic in the question, or any other images that you like:

enter image description here

Use ImageSize to control the final size of the button:

enter image description here

An alternative, that I use in some applications, is something like this:

help[$helpmessage_: "", $videolink_: ""] := 
  ActionMenu[
   Graphics[{{RGBColor[0.689647, 0.761166, 0.805478], 
      Disk[{0, 0}, 0.1]}, {GrayLevel[0], Circle[{0, 0}, 0.1], 
      Style[Inset["?", {0.01, 0}], "Label", FontSize -> 11]}},
    ImageSize -> {20, 20}],
   {"Help Notes" :> MessageDialog[
      Grid[{
        {Style[$helpmessage, LineIndent -> 0]}
        },
       Alignment -> {Center, Center},
       ItemSize -> {Automatic, All},
       Spacings -> {0, 0}],
      Background -> White],
    "View Video" :> SystemOpen[$videolink]},
   Appearance -> None,
   BaseStyle -> {},
   FrameMargins -> {{0, 0}, {-2, -2}},
   ImageSize -> {20, 20}];

enter image description here

Why not just use the graphic in the question, or any other images that you like:

enter image description here

Why not just use the graphic in the question, or any other images that you like:

enter image description here

Use ImageSize to control the final size of the button:

enter image description here

An alternative, that I use in some applications, is something like this:

help[$helpmessage_: "", $videolink_: ""] := 
  ActionMenu[
   Graphics[{{RGBColor[0.689647, 0.761166, 0.805478], 
      Disk[{0, 0}, 0.1]}, {GrayLevel[0], Circle[{0, 0}, 0.1], 
      Style[Inset["?", {0.01, 0}], "Label", FontSize -> 11]}},
    ImageSize -> {20, 20}],
   {"Help Notes" :> MessageDialog[
      Grid[{
        {Style[$helpmessage, LineIndent -> 0]}
        },
       Alignment -> {Center, Center},
       ItemSize -> {Automatic, All},
       Spacings -> {0, 0}],
      Background -> White],
    "View Video" :> SystemOpen[$videolink]},
   Appearance -> None,
   BaseStyle -> {},
   FrameMargins -> {{0, 0}, {-2, -2}},
   ImageSize -> {20, 20}];

enter image description here

1
source | link

Why not just use the graphic in the question, or any other images that you like:

enter image description here