Update icons, change styling

public/images/mentalMathThumb.svg

@@ -25,10 +25,10 @@
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      showgrid="false"
      inkscape:zoom="1.3576599"
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+     inkscape:cx="-135.15903"
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      inkscape:window-width="1904"
-     inkscape:window-height="1003"
+     inkscape:window-height="975"
      inkscape:window-x="35"
      inkscape:window-y="32"
      inkscape:window-maximized="0"
@@ -49,26 +49,17 @@
        aria-label="+"
        id="text1156"
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 </svg>