My qt-style.css

article-style.css

#.dsl_headwords
#{
#  white-space: nowrap;
#}
#.gddictname
#{
#  width: 50%;
#  white-space: nowrap;
#  text-overflow: ellipsis;
#  overflow: hidden;
#  display: block;
#}

body
{
  /*line-height: 80%;*/
  margin-top: 1px;
  margin-right: 3px;
  margin-left:  2px;
  margin-bottom: 3px;
  background: white;
  font-family: TahomaPlus, Segoe UI, Palatino Linotype, Arial Unicode MS;
}

.gdarticle 
{ 
  margin-top: 0.1em;
  margin-bottom: 0.4em;
  padding: 5px;
  border: 1px solid #d0dde2;
  border-radius: 8px;  
} 
 
.gdactivearticle 
{ 
  border: 1px solid #3399FF;
} 

.gdarticleseparator + script + .gdactivearticle .gddictname
{
  border-top: 1px solid #3399FF;
}

.gdarticleseparator 
{ 
  display: none; 
}

.gddictname 
{
  font-size: 12px;
  font-weight: normal;
  float: right;
  border: 0px;
  border-top-right-radius: 8px;
  border-bottom-left-radius: 6px;
  margin: -6px;
  margin-bottom: 5px;
  margin-left: 2px;
  padding-right: 0.4em;
  color: #4480f8;
  background: #E0E8F0;

  -webkit-user-select: none;
  user-select: none;
  cursor: default;
} 

.gdactivearticle .gddictname
{
  font-size: 13px;
  font-weight: normal;
  margin: -6px;
  margin-bottom: 5px;
  margin-left: 2px;
  
  float: right;
  border: 1px solid #3399FF;
  color: #0066cc;
  background: #deecf8;
}

.gddicticon
{
  display: inline;
  vertical-align: text-bottom;
  float: right;
  padding-right: 0em;
  padding-left: 0.3em;
}

/* The first headword in a (possibly) multi-headword DSL article */
.gdarticlebody > span:first-child .dsl_headwords,
.gdarticlebody > h3:first-child
{
  margin-top: -3px;
  display: inline-block;
}

.gdspellsuggestion
{
  /* Add some vertical space before the article */
  margin-top: 1.5em;
}

.dsl_ex
{
  color: steelblue;
}

.dsl_stress
{
  color: darkblue;
}

.dsl_stress_without_accent {
  display:inline;
}

.dsl_stress_with_accent {
  display: none;
}

.dsl_p .dsl_ex .dsl_lang
{
  color: green;
}

::selection {
  background:#cc0000;
	color:#fff;
}

code::selection {
	background: #333333;
}

.dsl_s_wav img, .lsa_play img, .forvo_play img[alt="Play"] {
    display: none;
}

.dsl_s_wav a, .lsa_play td:nth-of-type(1) a, .forvo_play td:nth-of-type(1) a {
    display: inline-block;
    width: 17px;
    height: 16px;
    background: url('file:///control_play_lingvo.png') no-repeat center;
    vertical-align: text-bottom;
    -webkit-user-select: none;
    user-select: none;
}

qt-style.css

/* WARNING: hides all separators! */
#navToolbar::separator {
  width: 0px;
}


/* Another way to hide specific separators */
#navToolbar #beforeOptionsSeparator, #navToolbar #beforeScanPopupSeparator, #navToolbar #afterScanPopupSeparator, #navToolbar #separatorBeforeZoom, #navToolbar #separatorBeforeSave {
  background: rgba(0,0,0,0%);
  width: 0px;
  margin: -3px;
}


/* Hide various buttons in the toolbar: */
#navToolbar #menuButtonXX, #navToolbar #soundButtonXX, #navToolbar #backButton, #navToolbar #forwardButton, #navToolbar #zoomInButton, #navToolbar #zoomOutButton, #navToolbar #zoomBaseButton, #navToolbar #saveArticleButton, #navToolbar #printButton {
  width:   0px;
  height:  0px;
  margin:  -3px;
}

/* remove the main toolbar handle */
#navToolbar::handle, #dictionaryBar::handle {
  image: none;
  width:  0px;
  margin-left: 1px;
}

#navToolbar #scanPopupButton {
  margin-left: 5px;
}

/* Colored header for the "Found in Dictionaries:" pane */
#dictsPaneTitleBar {
  background: lightblue;
  margin: 2px;
}

/* Colored header for the History Pane */
#historyPaneTitleBar {
  background: lightsteelblue;
  margin: 2px;
}

/* Thin separators between the main UI and sidebars */
QMainWindow::separator {
     width:  1px; /* when vertical */
     height: 1px; /* when horizontal */
}

ScanPopup #goBackButtonAA,
/* ScanPopup #queryError,        */
ScanPopup #goForwardButtonAA,
ScanPopup #wordListButtonXX,
ScanPopup #pronounceButtonAA,
ScanPopup #sendWordButtonXX
/* ScanPopup #showDictionaryBar, */
/* ScanPopup #pinButton */
{
  width: 0px;
  height: 0px;
  margin: -4px;
}

/*
#historyList {
  font-weight: bold;
}

#historyList::item {
  background: black;
  color: yellow;
}

#historyList::item:selected {
  background: gray;
}
*/

/* 
#historyList::item:alternate {
  background: #EEEEEE;
  color: black;
}
*/

/*
ScanPopup
{
  min-width:50px;
}
*/

/*
MainWindow #dictsPane #dictsList 
{
  min-width:200px !important;
}
*/

/*
MainWindow #ArticleView 
{ 
    min-width: 50px; 
}
*/

I copy it to my computer, but can't take effect.