Media query not working, hiding Bootstrap jumbotron when viewed from mobile device -


can't media query work, trying hide jumbotron when viewed mobile device.

url tyrescanner.net code below 

  /* small devices, phones */     @media screen , (max-width: 380px) {          .customjumbotron{              background-color: black;          }      }
        <div class="row no-container">              <div class="col-md-12">                          <div class="jumbotron text-center customjumbotron">                                      <img class="img-responsive image-center" src="../images/nectar-collectpoints.png" height="130" width="490" style= "margin-bottom: -10px"" />                      <h2>search tyres , prices in local area</h2>                                                                    <div class="searchbox">                         <div class="input-group input-group-lg">                                      <div class="input-btn-toolbar" style="width:107%; height: 100%;">                                                                                       <div class="input-btn-toolbar" style=" background-color:#313131; padding-left:5px; padding-top:7px; padding-bottom:3px; padding-right:3px;">                                                                                                    <asp:textbox style="text-transform: uppercase; width:100%; font-size: 23px; text-align: center;" id="txtreg" class="form-control"  runat="server" placeholder="enter registration"></asp:textbox>                                                                                <span class="input-group-btn" >                                                                                                <asp:linkbutton class ="btn btn-default btn-default1" onclick="buttonsearch_click"  height="49"  runat="server" type="button" style="color:white" id="bntsearch"><span aria-hidden="true" class="glyphicon glyphicon-search"></span></asp:linkbutton>                                   </span>                             </div>                              </div>                           </div>                        </div>                   </div>              </div>          </div>

to make jumbotron appear black background on small screens, add color: black; media query. way, in jumbotron appear black (though there more elegant ways it).

working example:

  /* small devices, phones */     @media screen , (max-width: 380px) {          .customjumbotron{              background-color: black;              color: black;          }          #imgid {              display: none;          }          #imghide {              display: block;          }      }      /* larger devices */     @media screen , (min-width: 381px) {          #imghide {              display: none;          }      }
        <div class="row no-container">              <div class="col-md-12">                          <div class="jumbotron text-center customjumbotron">                                      <img class="img-responsive image-center" id="imgid" src="../images/nectar-collectpoints.png" height="130" width="490" style="margin-bottom: -10px" />                      <img class="img-responsive image-center" id="imghide" src="" height="130" width="490" style="margin-bottom: -10px"></div>                      <h2>search tyres , prices in local area</h2>                                                                    <div class="searchbox">                         <div class="input-group input-group-lg">                                      <div class="input-btn-toolbar" style="width:107%; height: 100%;">                                                                                       <div class="input-btn-toolbar" style=" background-color:#313131; padding-left:5px; padding-top:7px; padding-bottom:3px; padding-right:3px;">                                                                                                    <asp:textbox style="text-transform: uppercase; width:100%; font-size: 23px; text-align: center;" id="txtreg" class="form-control"  runat="server" placeholder="enter registration"></asp:textbox>                                                                                <span class="input-group-btn" >                                                                                                <asp:linkbutton class ="btn btn-default btn-default1" onclick="buttonsearch_click"  height="49"  runat="server" type="button" style="color:white" id="bntsearch"><span aria-hidden="true" class="glyphicon glyphicon-search"></span></asp:linkbutton>                                   </span>                             </div>                              </div>                           </div>                        </div>                   </div>              </div>          </div>

edit: hides image in jumbotron small screens.


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