Docs: Adjust swatch style

Fix styling to that caused swatches to not quite be aligned right.

Author: facelessuser

docs/src/scss/_swatch.scss

@@ -20,10 +20,7 @@
 .swatch {
   display: inline-block;
   box-sizing: border-box;
-  width: convert.px2em(20px);
-  height: convert.px2em(20px);
   margin-right: 0.2em;
-  margin-left: 0.25em;
   line-height: 0;
   vertical-align: text-bottom;
   background: var(--transparency);