Css darken

filter: brightness(85%);

> 100% = baseline
> 85% = slightly darker
> 29% = significantly darker

Source: grepper.com

Css darken

.button {
  color: #ff0000;
}

/* note: 100% is baseline so 85% is slightly darker, 
   20% would be significantly darker */
.button:hover {
  filter: brightness(85%);
}

Source: stackoverflow.com

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