docs: Update showcase.md (#1031)

Xinyang Yu

2024-03-24 85a737b4ee72fb4dba12e1aacbd87d1636cfc30e

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code[data-theme*=" "] {
  color: var(--shiki-light);
  background-color: var(--shiki-light-bg);
}
 
code[data-theme*=" "] span {
  color: var(--shiki-light);
}
 
[saved-theme="dark"] code[data-theme*=" "] {
  color: var(--shiki-dark);
  background-color: var(--shiki-dark-bg);
}
 
[saved-theme="dark"] code[data-theme*=" "] span {
  color: var(--shiki-dark);
}