微信小程序中如何改变switch的样式

.wx-switch-input{
width:80rpx !important;
height:48rpx !important;
}
/白色样式（false的样式）/
.wx-switch-input::before{
width:75rpx !important;
height: 44rpx !important;
}
/白色小球样式（true的样式）/
.wx-switch-input::after{
width: 40rpx !important;
height: 40rpx !important;
}