css - Changing the theme color of class" well" in bootstrap -

<div class="col-md-4" style="margin-top:30px;"  id="subscriber_page">       <div class="well">         <form>               <h3> subscribe now! </h3>               <label for="name"> fullname </label>                <input type="text" class="form-control" placeholder="input fullname here" id="name" required/>               <br />               <label for="name"> address </label>               <input type="text" class="form-control" placeholder="input full address here" id="address" required/>               <br /> <br /> <br />              <center><button type="submit" class="btn btn-primary">subscribe</button></center>              </div>         </form>       </div>      </div> 

hi there, can me bootstrap theme in login page? don't current color of in bootstrap. there way can change color on it? tried css code didn't work.

i tried following:

.well{   background: #000000; } 

you can use !important after color

.well{ background: #000 !important; }