右侧背景图

通过关键字

background-image: url('/Wx/Index/image/not_select.png');
background-size: px2rem(78px) px2rem(73px);
background-repeat: no-repeat;
background-position:top right;

也可以通过百分比

background-image: url('/Wx/Index/image/not_select.png');
background-size: px2rem(78px) px2rem(73px);
background-repeat: no-repeat;
background-position:90% 0%;

也可以通过像素

background-image: url('/Wx/Index/image/not_select.png');
background-size: px2rem(78px) px2rem(73px);
background-repeat: no-repeat;
background-position:10px 0px;