Codigo ....

.dd-textarea #text_editor_textarea{background:url(https://i.imgur.com/icD2n.png) no-repeat 0px -69px;}
.dd-textarea #text_editor_textarea{width:600px !important;}
.dd-textarea #text_editor_textarea:focus{
background:url(https://i.servimg.com/u/f42/17/32/13/00/icd2n10.png) no-repeat 0px -69px;
box-shadow:1px 1px 8px 4px #353535;
-moz-box-shadow:1px 1px 8px 4px #353535;
-webkit-box-shadow:0px 0px 8px 0px #a1a1a1}
.dd-textarea #text_editor_textarea:hover{
background:url(https://i.servimg.com/u/f42/17/32/13/00/icd2n10.png) no-repeat 0px -69px;
box-shadow:1px 1px 8px 4px #353535;
-moz-box-shadow:1px 1px 8px 4px #353535;
-webkit-box-shadow:0px 0px 8px 0px #a1a1a1}