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Enable submit button after file seleted


.course-outline-left summary::-webkit-details-marker {
  display: none
}

.course-outline-left summary::-moz-details-marker {
  display: none
}


.course-outline-left summary:after {
  content: "+"; 
  color: #40BFEE; 
  float: left; 
  font-size: 22px; 
  font-weight: bold; 
  margin: -5px 10px 0 0; 
  padding: 0; 
  text-align: center; 
  width: 20px;
}
.course-outline-left details[open] summary:after {
  content: "-";
}