add border to pictures using css

doc/TinySpHEAR_simple.md

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 The TinySpHEAR microphone is a traditional 4 capsule tetrahedral first order Ambisonics microphone. The full design as previewed in OpenScad and a picture of the first prototype. 
 
-<a href="TinySpHEAR"><img src="pictures/TinySpHEAR_prototype.png" align="left" width="200" ></a>
+<a href="pictures/TinySpHEAR_prototype.png"><img src="pictures/TinySpHEAR_prototype.png" align="center" width="600" style="border:5px solid white></a>
 
 The four capsule holders come in two flavors, one for the upper two capsules and another for the bottom two capsules that connect into the microphone mount. The capsule holders have legs with fingers that interlock and hold the structure together. There are two styles of usable interconnections, horizontal legs (easier to print and assemble, a bit bigger) and vertical legs (more difficult to print and assemble but more compact).
 
-![TinySpHEAR, horizontal legs](pictures/TinySpHEAR_hlegs_10mm_10mm.png "TinySpHEAR with horizontal legs, 10mm radius")
+<a href="pictures/TinySpHEAR_hlegs_10mm_10mm.png"><img src="pictures/TinySpHEAR_hlegs_10mm_10mm.png" align="center" width="600" style="border:5px solid white></a>
 
-![TinySpHEAR, vertical legs](pictures/TinySpHEAR_vlegs_10mm_10mm6.png "TinySpHEAR with vertical legs, 10.6mm radius")
+<a href="pictures/TinySpHEAR_vlegs_10mm_10mm6.png"><img src="pictures/TinySpHEAR_vlegs_10mm_10mm6.png" align="center" width="600" style="border:5px solid white></a>
 
 Both pictures are renderings of a microphone with 10mm capsules.