Mailspring/packages/client-app/internal_packages/ui-ubuntu/styles/ui-variables.less

@import "../../../static/variables/ui-variables";

@accent-primary:            #f07746;
@accent-primary-dark:       darken(#f07746, 1%);

@border-color-secondary:   lighten(@background-secondary, 10%);

@toolbar-background-color: #41403b;
@light:  rgb(246, 246, 246);

.sheet-toolbar .btn-toolbar img.content-mask {
  background-color: @light;
}

.sheet-toolbar-container {
  background-image: -webkit-linear-gradient(top,@toolbar-background-color, darken(@toolbar-background-color,5%));
  box-shadow: none;
  .btn {
    background: lighten(@toolbar-background-color,4%);
  }
  .btn.btn-toolbar {
    color: @light;
  }
  .toolbar-activity .activity-toolbar-icon {
    background: @light;
  }
}

.sheet-toolbar .item-back img.content-mask{
  background-color: @light;
}

.sheet-toolbar .item-back .item-back-title{
  color: @light;
}

.sheet-toolbar .selection-bar {
  .absolute {
    border-color: lighten(@toolbar-background-color, 5%);
    background-color: darken(@toolbar-background-color, 8%);

    .inner {
      .centered {
        color: @light;
      }
    }
  }
}

.btn-icon img.content-mask {
  background-color:@light;
  color: @light;
}

.btn-icon img.content-mask:hover {
  background-color:@accent-primary;
}