ui->comboBox->setStyleSheet("QComboBox{min-height: 40px; background-color: rgb(255, 255, 255);\
color: rgb(0, 0, 0);border:1px solid #d7d7d7; border-radius: 3px; padding: 1px 18px 1px 3px;} "
"QComboBox::drop-down{ width: 25px; }"
"QComboBox QAbstractItemView{background-color: rgb(255, 255, 255);color:rgb(0,0,0);font-size:16px;}"
"QComboBox QAbstractItemView:item{min-height: 30px; }");