[FR] Vault option to set a distinguishing color of the vault.

[gravistech412]

I have MANY vaults. When determining which vault is open, it would nice to easily visually distinguish between vaults. If we could set the background color of the vault (or the border-top of the splitter-layout)

<div class="splitter-layout vault-vaultname">
.vault-vaultname{
   border-top: green 8px solid;
}