Jquery mobile changing panel width

mobile-panel-size.less

@left-panel-width: 17em;
@right-panel-width: 35em;

.ui-panel {
    width: @left-panel-width;
}

.ui-panel.ui-panel-position-right {
    width: @right-panel-width;
}

.ui-panel.ui-panel-closed {
    width: 0;
}

.ui-panel-position-left {
    left: -@left-panel-width
}

.ui-panel-animate.ui-panel-position-left.ui-panel-display-overlay, .ui-panel-animate.ui-panel-position-left.ui-panel-display-push {
    -webkit-transform: translate3d(-@left-panel-width, 0, 0);
    -moz-transform: translate3d(-@left-panel-width, 0, 0);
    transform: translate3d(-@left-panel-width, 0, 0)
}

.ui-panel-position-right {
    right: -@right-panel-width
}

.ui-panel-animate.ui-panel-position-right.ui-panel-display-overlay, .ui-panel-animate.ui-panel-position-right.ui-panel-display-push {
    -webkit-transform: translate3d(@right-panel-width, 0, 0);
    -moz-transform: translate3d(@right-panel-width, 0, 0);
    transform: translate3d(@right-panel-width, 0, 0)
}

.ui-panel-content-fixed-toolbar-position-left.ui-panel-content-fixed-toolbar-open, .ui-panel-content-wrap-position-left.ui-panel-content-wrap-open, .ui-panel-dismiss-position-left.ui-panel-dismiss-open {
    left: @left-panel-width;
    right: -@right-panel-width
}

.ui-panel-animate.ui-panel-content-fixed-toolbar-position-left.ui-panel-content-fixed-toolbar-open.ui-panel-content-fixed-toolbar-display-reveal, .ui-panel-animate.ui-panel-content-fixed-toolbar-position-left.ui-panel-content-fixed-toolbar-open.ui-panel-content-fixed-toolbar-display-push, .ui-panel-animate.ui-panel-content-wrap-position-left.ui-panel-content-wrap-open.ui-panel-content-wrap-display-reveal, .ui-panel-animate.ui-panel-content-wrap-position-left.ui-panel-content-wrap-open.ui-panel-content-wrap-display-push {
    -webkit-transform: translate3d(@left-panel-width, 0, 0);
    -moz-transform: translate3d(@left-panel-width, 0, 0);
    transform: translate3d(@left-panel-width, 0, 0)
}

.ui-panel-content-fixed-toolbar-position-right.ui-panel-content-fixed-toolbar-open, .ui-panel-content-wrap-position-right.ui-panel-content-wrap-open, .ui-panel-dismiss-position-right.ui-panel-dismiss-open {
    left: -@left-panel-width;
    right: @right-panel-width
}

.ui-panel-animate.ui-panel-content-fixed-toolbar-position-right.ui-panel-content-fixed-toolbar-open.ui-panel-content-fixed-toolbar-display-reveal, .ui-panel-animate.ui-panel-content-fixed-toolbar-position-right.ui-panel-content-fixed-toolbar-open.ui-panel-content-fixed-toolbar-display-push, .ui-panel-animate.ui-panel-content-wrap-position-right.ui-panel-content-wrap-open.ui-panel-content-wrap-display-reveal, .ui-panel-animate.ui-panel-content-wrap-position-right.ui-panel-content-wrap-open.ui-panel-content-wrap-display-push {
    -webkit-transform: translate3d(-@right-panel-width, 0, 0);
    -moz-transform: translate3d(-@right-panel-width, 0, 0);
    transform: translate3d(-@right-panel-width, 0, 0)
}

@media (min-width:55em) {
    .ui-responsive-panel.ui-page-panel-open .ui-panel-content-fixed-toolbar-display-push.ui-panel-content-fixed-toolbar-position-left, .ui-responsive-panel.ui-page-panel-open .ui-panel-content-fixed-toolbar-display-reveal.ui-panel-content-fixed-toolbar-position-left, .ui-responsive-panel.ui-page-panel-open .ui-panel-content-wrap-display-push.ui-panel-content-wrap-position-left, .ui-responsive-panel.ui-page-panel-open .ui-panel-content-wrap-display-reveal.ui-panel-content-wrap-position-left {
        margin-right: @right-panel-width
    }

    .ui-responsive-panel.ui-page-panel-open .ui-panel-content-fixed-toolbar-display-push.ui-panel-content-fixed-toolbar-position-right, .ui-responsive-panel.ui-page-panel-open .ui-panel-content-fixed-toolbar-display-reveal.ui-panel-content-fixed-toolbar-position-right, .ui-responsive-panel.ui-page-panel-open .ui-panel-content-wrap-display-push.ui-panel-content-wrap-position-right, .ui-responsive-panel.ui-page-panel-open .ui-panel-content-wrap-display-reveal.ui-panel-content-wrap-position-right {
        margin-left: @left-panel-width
    }
}

I really appreciate this gist. I tried implementing something of a CSS variety before but yours has the same problem as mine did. The right panel is indeed twice the width of the left panel, but if you click anywhere on the left side of the right panel it closes. Something in jquery mobile is watching clicks and needs to be modified as well.

Here is what fixed it. The dismiss was positioned incorrectly. Here is the fixed rules.

.ui-panel-content-fixed-toolbar-position-left.ui-panel-content-fixed-toolbar-open, .ui-panel-content-wrap-position-left.ui-panel-content-wrap-open, .ui-panel-dismiss-position-left.ui-panel-dismiss-open {
left: @left-panel-width;
right: -@left-panel-width
}

.ui-panel-content-fixed-toolbar-position-right.ui-panel-content-fixed-toolbar-open, .ui-panel-content-wrap-position-right.ui-panel-content-wrap-open, .ui-panel-dismiss-position-right.ui-panel-dismiss-open {
left: -@right-panel-width;
right: @right-panel-width
}

Really useful GIST. I added :

.ui-panel-animate.ui-panel-page-content-position-left {
    left: 0;
        right: 0;
        -webkit-transform: translate3d(@left-panel-width,0,0);
        -moz-transform: translate3d(@left-panel-width,0,0);
        transform: translate3d(@left-panel-width,0,0);
}

to push also the content correctly to the right when the left panel is open. I guess same should be done to the left push.

I needed to add this to modify the right panel, thanks to dawez for the pattern and suggestion ;)

.ui-panel-animate.ui-panel-page-content-position-right {
  left: 0;
  right: 0;
  -webkit-transform: translate3d(-@right-panel-width,0,0);
  -moz-transform: translate3d(-@right-panel-width,0,0);
  transform: translate3d(-@right-panel-width,0,0);
}