Misago/static/admin/css/admin/buttons.less

.button-colors (@btnColor) {
  background: @btnColor;
  border: 1px solid @btnColor;
  *border: 0;
}

.button-icon (@default, @hover: 100) {
  i {
    .opacity(@default);
  }
  
  &:hover, &:active {
    i {
      .opacity(@hover);
    }
  }
}

.button-style (@background, @highlight) {
  .button-colors(@background);

  color: darken(@white, 3%);
  text-shadow: 0px 1px 0px darken(@background, 5%);

  &:hover, &:active {
    .button-colors(@highlight);
  }
}

.btn {
  .button-colors(@btnBackground);
  .box-shadow(none);
  padding: 4px 10px;
  
  color: lighten(@gray, 10%);
  font-weight: bold;
  text-shadow: none;
  
  &:hover, &:active {
    .button-colors(@btnBackgroundHighlight);
    box-shadow: none;
  
    color: @linkColor;
  }
  
  .button-icon(70);
  
  &.btn-primary,
  &.btn-info,
  &.btn-success,
  &.btn-warning,
  &.btn-danger,
  &.btn-inverse {
    .button-icon(90);
  
    color: darken(@white, 5%);
  
    &:hover, &:active {  
      color: @white;
    }
  }
  
  &.btn-primary {
    .button-colors(@btnPrimaryBackground);
    .button-style(@btnPrimaryBackground, @btnPrimaryBackgroundHighlight);
  }
  
  &.btn-info {
    .button-colors(@btnInfoBackground);
    .button-style(@btnInfoBackground, @btnInfoBackgroundHighlight);
  }
  
  &.btn-success {
    .button-colors(@btnSuccessBackground);
    .button-style(@btnSuccessBackground, @btnSuccessBackgroundHighlight);
  }
  
  &.btn-warning {
    .button-colors(@btnWarningBackground);
    .button-style(@btnWarningBackground, @btnWarningBackgroundHighlight);
  }
  
  &.btn-danger {
    .button-colors(@btnDangerBackground);
    .button-style(@btnDangerBackground, @btnDangerBackgroundHighlight);
  }
  
  &.btn-inverse {
    .button-colors(@btnInverseBackground);
    .button-style(@btnInverseBackground, @btnInverseBackgroundHighlight);
  }
  
  &.btn-link {
    background: none;
    border: none;
  
    &:hover, &:active {
      color: @linkColorHover;
      
      text-decoration: none;
    }
  }
}