style.css

/* Remove margins and padding from the list */
ul#myUL {
  margin: 0;
  padding: 0;
}

/* Style the list items */
ul#myUL li {
  cursor: pointer;
  position: relative;
  padding: 12px 8px 12px 40px;
  list-style-type: none;
  background: #eee;
  font-size: 18px;
  transition: 0.2s;
  
  /* make the list items unselectable */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
      margin-bottom: 7px;
}

/* Set all odd list items to a different color (zebra-stripes) */
ul#myUL li:nth-child(odd) {
  background: #f9f9f9;
}

/* Darker background-color on hover */
ul#myUL li:hover {
  background: #ddd;
}

/* When clicked on, add a background color and strike out text */
ul#myUL li.checked {
  background: #888;
  color: #fff;
  text-decoration: line-through;
}

/* Add a "checked" mark when clicked on */
ul#myUL li.checked::before {
  content: '';
  position: absolute;
  border-color: #fff;
  border-style: solid;
  border-width: 0 2px 2px 0;
  top: 10px;
  left: 16px;
  transform: rotate(45deg);
  height: 15px;
  width: 7px;
}

/* thread cont box */

ul#myUL ul.taskNotes {
    background-color: #f5f5f5;
    text-align: left;
    border-left: 2px solid #000;
    padding-left: 0px;
    margin-left: 30px;

}
ul#myUL ul.taskNotes > li {
    font-size: 14px !important;
    font-style: italic;
    color: #000;
        margin-bottom: 0px;
}
ul#myUL ul.taskNotes > li:nth-child(even) {
    background-color:rgba(0,0,0,.1);

  }
ul#myUL ul.taskNotes > li:nth-child(odd) {
    background-color:rgba(0,0,0,.2);

  }
  p.task_description {
    text-align: left;
    padding-left: 30px;
}
span.no_desc{
   font-style: italic;
    color: #ccc;
}

/* Style the input */
input {
  border: none;
  width: 75%;
  padding: 10px;
  float: left;
  font-size: 16px;
}

/* Style the "Add" button */
.addBtn {
  width: 25%;
    color: #fff;
    background-color: #337ab7;
    border-color: #2e6da4;
  float: left;
  cursor: pointer;
  box-shadow: none;
  border: 0;
  border-radius: 5px;

      display: inline-block;
    padding: 6px 12px;
    margin-bottom: 0;
    font-size: 14px;
    font-weight: 400;
    line-height: 1.42857143;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;

}

.addBtn:hover {
   background-color: #337ab7;
    border-color: #2e6da4;
}