I did get it to work on the right side (haven’t tested across browsers/devices).
Edits made in the Plugin file: simple-side-tab/simple_side_tab.php
.rum_sst_left {
right:-90px;
cursor: pointer;
-webkit-transform-origin:0 0;
-moz-transform-origin:0 0;
-o-transform-origin:0 0;
-ms-transform-origin:0 0;
-webkit-transform:rotate(270deg);
-moz-transform:rotate(270deg);
-ms-transform:rotate(270deg);
-o-transform:rotate(270deg);
transform:rotate(270deg);
<!--[if lte IE 8]>
/* Internet Explorer 8 and below */
-ms-transform:rotate(270deg) / !important;
*filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=3);
<![endif]-->
}
Nice and simple plugin, would be amazing if it opened into a widget area