.number-lessons {
  position: absolute;
  top: -2px;
  right: -4px;
  background: #f0f0f0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  padding: 5px 7px;
  box-shadow: inset 0 0px 3px #777;
  line-height: 9px;
  font-size: 13px;
  font-weight: 600;
  color: rgba(77, 77, 77, 0.8666666667);
}

.checkbox {
  background-color: #fff;
  display: inline-block;
  height: 28px;
  margin: 0 0.25em;
  width: 28px;
  border-radius: 4px;
  border: 1px solid #ccc;
  float: right;
}
.checkbox span {
  display: block;
  height: 28px;
  position: relative;
  width: 28px;
  padding: 0;
  margin-top: 0 !important;
}
.checkbox span:after {
  transform: scaleX(-1) rotate(135deg);
  transform-origin: left top;
  border-right: 4px solid #fff;
  border-top: 4px solid #fff;
  content: "";
  display: block;
  height: 20px;
  left: 3px;
  position: absolute;
  top: 15px;
  width: 10px;
}
.checkbox span:hover:after {
  border-color: #999;
}
.checkbox input {
  display: none;
}
.checkbox input:checked + span:after {
  animation: check 0.8s;
  border-color: #555;
}
.checkbox input:checked.default:after {
  border-color: #444;
}

.list-group-item {
  padding: 0.15rem 0.5rem !important;
  border: unset;
}
.list-group-item:hover {
  background: #ecedff !important;
}
.list-group-item:nth-child(even) {
  background: #f4f4f4;
}

.sidebar-list-grade li a.active {
  background: none !important;
  color: #2c2d66 !important;
}