I have found the solution . Hope it will help you
Step 1. Go to – Plugins >> Sticky Popups >> Edit >> sticky-popup/css/sticky-popup.css
Step 2. Replace code –
.sticky-popup-left .popup-title
{
padding:10px;
writing-mode:tb-rl;
-webkit-transform:rotate(90deg);
-moz-transform:rotate(90deg);
-o-transform: rotate(90deg);
white-space:nowrap;
display: block;
}
with
.sticky-popup-left .popup-title {
padding:10px;
writing-mode:tb-rl;
webkit-transform:rotate(90deg);
moz-transform:rotate(90deg);
o-transform: rotate(90deg);
white-space:nowrap;
display: block;
}
or
copy the new code in the end of css