Using box-shadow instead of 1px border

This was suggested at #256.

Closes #256

Signed-off-by: Manuel Rego Casasnovas <[email protected]>

Author: mrego

assets/css/style.css.liquid

@@ -758,8 +758,7 @@ table {
 
 
   background-color: var(--midturquoise);
-  border-color: hsl(0, 0%, 86%);
-  border-width: 1px;
+  box-shadow: 0 0 1px 1px  hsl(0, 0%, 86%);
   color: hsl(0, 0%, 100%);
   cursor: pointer;
   justify-content: center;
@@ -785,8 +784,7 @@ table {
 
 
   background-color: var(--midturquoise);
-  border-color: hsl(0, 0%, 86%);
-  border-width: 1px;
+  box-shadow: 0 0 1px 1px  hsl(0, 0%, 86%);
   color: hsl(0, 0%, 100%);
   cursor: pointer;
   justify-content: center;