style.css

MxButton.menu-button > MxLabel {
  color: #000000;
}

MxButton.menu-button {
  padding: 3 3 3 3;
  border-image: url("button.png") 1;
}
MxButton.menu-button:hover {
  padding: 3 3 3 3;
  border-image: url("button.png") 1;
}
MxButton.menu-button:active {
  padding: 4 2 2 4;
  border-image: url("button-active.png") 1;
}
MxButton.menu-button:checked {
  padding: 4 2 2 4;
  border-image: url("button-active.png") 1;
}
MxButton.menu-button:checked:hover {
  padding: 4 2 2 4;
  border-image: url("button-active.png") 1;
}
MxButton.menu-button:checked:active {
  padding: 4 2 2 4;
  border-image: url("button-active.png") 1;
}

MxButton.collapse-button {
  padding: 0;
  font-size: 12;
  color: #ffffff99;
  border-image: none;
}
MxButton.collapse-button:hover {
  padding: 0;
  font-size: 12;
  color: #ffffffcc;
  border-image: none;
}
MxButton.collapse-button:active {
  padding: 0;
  font-size: 12;
  color: #ffffffff;
  border-image: none;
}

MxScrollView {
  background-color: transparent;
  -mx-scrollbar-width: 10;
  -mx-scrollbar-height: 10;
  /* For the rationale behind this, see TerminalView.vala */
  padding: 15 0 0 0;
}

MxScrollView MxBoxLayout {
  /* For the rationale behind this, see TerminalView.vala */
  padding: 0 0 15 0;
}

MxScrollBar {
  /* Hack to hide the stepper buttons, which is not possible in Mx */
  /* For the rationale behind this, see TerminalView.vala */
  padding: -10 2 20 2;
}

MxScrollBar *.htrough,
MxScrollBar *.vtrough {
  background-color: #666666cc;
  border-image: none;
}

MxScrollBar MxButton.hhandle,
MxScrollBar MxButton.vhandle {
  background-color: #ffffff66;
  border-image: none;
}
MxScrollBar MxButton.hhandle:hover,
MxScrollBar MxButton.vhandle:hover {
  background-color: #ffffff99;
  border-image: none;
}
MxScrollBar MxButton.hhandle:active,
MxScrollBar MxButton.vhandle:active {
  background-color: #ffffffcc;
  border-image: none;
}

MxLabel.progress-label {
  padding: 2 5 4 5;
  color: #ffffff;
  /* TODO: This should work according to https://github.com/clutter-project/mx/commit/c108215, but doesn't */
  /*text-shadow: 2 2 2 #000000;*/
}

/* This is the workaround */
MxLabel.progress-label-shadow {
  padding: 3 4 3 6;
  color: #000000;
}

MxProgressBar {
  background-color: #77777766;
  border-image: none;
}

MxProgressBar MxProgressBarFill {
  background-color: #92b932cc;
  border-image: none;
}