CSS / Bootstrap 3: remove styling from links

To make it complete (does not change colour on hover or after clicking it and inherits text-decoration, too):

.deco-none {
  color: inherit;
  text-decoration: inherit;
}

.deco-none:link {
  color: inherit;
  text-decoration: inherit;
}

.deco-none:hover {
  color: inherit;
  text-decoration: inherit;
}

Example Snippet

.deco-none {
  color: inherit;
  text-decoration: inherit;
}
.deco-none:link {
  color: inherit;
  text-decoration: inherit;
}
.deco-none:hover {
  color: inherit;
  text-decoration: inherit;
}
.bg-menu:hover {
  background-color: #0079C1;
  color: #FFFFFF;
}
.clickable {
  cursor: pointer;
}
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

<div class="row" style="width:400px;">
  <ul class="list-unstyled col-md-4">
    <li class="bg-menu clickable"><a href="#" class="deco-none">test1-1</a>
    </li>
    <li class="bg-menu clickable"><a href="#" class="deco-none">test1-2</a>
    </li>
    <li class="bg-menu clickable"><a href="#" class="deco-none">test1-3</a>
    </li>
  </ul>
  <ul class="list-unstyled col-md-4">
    <li class="bg-menu clickable"><a href="#" class="deco-none">test2-1</a>
    </li>
    <li class="bg-menu clickable"><a href="#" class="deco-none">test2-2</a>
    </li>
    <li class="bg-menu clickable"><a href="#" class="deco-none">test2-3</a>
    </li>
  </ul>
  <ul class="list-unstyled col-md-4">
    <li class="bg-menu clickable"><a href="#" class="deco-none">test3-1</a>
    </li>
    <li class="bg-menu clickable"><a href="#" class="deco-none">test3-2</a>
    </li>
    <li class="bg-menu clickable"><a href="#" class="deco-none">test3-3</a>
    </li>
  </ul>
</div>

You got it wrong in CSS. Try this

FIDDLE

a.deco-none {
    color:#000000 !important;
    text-decoration:none;

}

.bg-menu:hover {
    background-color:#0079C1;
    color:#FFFFFF;
}

.clickable {
    cursor:pointer; 
}

Below code is wrong

a.deco-none: {
    color:#000000 !important;
    text-decoration:none;
}

I would suggest to use the inherit keyword to inherit the parents color. I know you wanted them black, but I'm sure that other users will find it helpful.

a.deco-none {
    color: inherit;
    text-decoration:none;
}

as Dimitry K said, you had the a.deco-none: typo.