自定义QSS

/*QComboBox*/

QComboBox {
border: 1px solid rgb(111, 156, 207);
border-radius: 3px;
padding: 1px 18px 1px 3px;
min-width: 6em;
max-width:6em;
}
QComboBox::drop-down {
subcontrol-origin: padding;
subcontrol-position: top right;
width: 15px;
border-left-width: 1px;
border-left-color: darkgray;
border-left-style: solid;
border-top-right-radius: 3px;
border-bottom-right-radius: 3px;
}
QComboBox QAbstractItemView {
border: 2px solid darkgray;
selection-background-color: lightgray;
}

/*QLineEdit*/

QLineEdit{
min-width:50px;
max-width:50px;
border: 2px solid gray;
border-radius: 10px;
padding: 0 8px;
background: yellow;
selection-background-color: darkgray;
}

/*QPushButton*/

QPushButton{
min-width:75px;
max-width:75px;
min-height:20px;
border:1px solid black;
border-radius:5px;
margin-left:60px;
}
QPushButton:hover{
background-color: #333333;
border-color: #444444;
color:rgb(255,255,255);
}
QPushButton:pressed{
background-color: #111111;
border-color: #333333;
color: yellow;
}