HTML,CSS checkbox label position should be on top of checkbox

good day, I am not good at CSS and I am getting a hard time to position the checkbox label on top of checkbox itself. Can you please help me? I want it the label also to be center formatted text because I want also to change the text dynamically using jquery. If I checked it, the "Fix" text will become "Fixed" and this text should remain its centered position on the top of the checkbox. Here is my JSFIDDLE >>> http://ift.tt/2frGUhT .

**Note: Please do not modify the "html" part, only the "css" part.

Thank you.

input[type="checkbox"]:not(:checked),
input[type="checkbox"]:checked {
  position: absolute;
  left: -9999px;
}
input[type="checkbox"]:not(:checked) + label,
input[type="checkbox"]:checked + label{
  position: relative;
  padding-left: 50px;
  cursor: pointer;
}


/* checkbox aspect */
input[type="checkbox"]:not(:checked) + label:before,
input[type="checkbox"]:checked + label:before {
  content: '';
  position: absolute;
  left:0; top: 2px;
  width: 40px; height: 40px;
  background: #f8f8f8;
  border-radius: 3px;
  border: 2px solid #aaa;
  -webkit-box-shadow: groove 0 0 13px rgba(0, 0, 0, 0.5);
  box-shadow: groove 0 0 13px rgba(0, 0, 0, 0.5);
}
/* checked mark aspect */
input[type="checkbox"]:not(:checked) + label:after,
input[type="checkbox"]:checked + label:after {
  content: '✔';
  position: absolute;
  top: 0; left: 5px;
  font-size: 34px;
  color: green;
  transition: all .2s;
  -webkit-transition: all .2s;
  -moz-transition: all .2s;
  -ms-transition: all .2s;
  -o-transition: all .2s;
}
/* checked mark aspect changes */
input[type="checkbox"]:not(:checked) + label:after {
  opacity: 0;
  transform: scale(0);
}
input[type="checkbox"]:checked + label:after {
  opacity: 1;
  transform: scale(1);
}

<div class="col-md-12">
   <input id="checkid"  type="checkbox">
   <label for="checkid">Fixed</label>
</div>