MediaWiki:Common.css

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.mw-ui-button {
  display: inline-block;
  background-color: #2b7cff;
  color: white !important;
  border: 1px solid #2b7cff;
  border-radius: 6px;
  padding: 0.4em 0.9em;
  text-decoration: none !important;
  font-weight: 600;
  cursor: pointer;
}

.mw-ui-button:hover {
  background-color: #1e63d6;
}