So, here's my screenshots, both with no padding.
Normal font:

Bold font:

Qt Code: 
  1. QTabWidget::pane {
  2.      background-color: #ffffff;
  3.      border: 2px solid #56aa04;
  4.      border-radius: 10px;
  5.      top: -1px;
  6.  }
  7.  
  8.  QTabWidget::tab-bar {
  9.      left: 15px;
  10.  }
  11.  
  12.  QTabBar::tab {
  13.      border: none;
  14.      color: #56aa04;
  15.      height: 25px;
  16.      font-weight: bold;
  17.  }
  18.  
  19.  QTabBar::tab:selected {
  20.      background-color: #ffffff;
  21.      border: 2px solid #56aa04;
  22.      border-top-left-radius: 10px;
  23.      border-top-right-radius: 10px;
  24.      border-bottom: 3px solid #ffffff;
  25.  }
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