container tab borders

[barslmn]

Thanks for the great extension.
Container tabs were looking undistinguished.

.Tab[data-pin="false"] .ctx {
  position:absolute;
  width:100%;
  height: 100%;
  background: none;
  border-style: solid;
  border-width:2px;
  border-color: var(--color);
  border-radius:var(--tabs-border-radius);
  transform:translateY(-40%)
}