remove border bottom in ion header

I have a problem trying to remove ion header border bottom in my ionic app

you could see my ionic header with border here

Here is the code of tab-home.html:

                <ion-view hide-nav-bar="true">
            <ion-header-bar align-title="left" class="bar-transparent" >
            <button menu-toggle="left" class="button button-icon ion-ios7-settings">
            </button>
            <div class="title">&nbsp;</div>
            <h1 class="title">proximiti</h1>
            </ion-header-bar>
            <!--<ion-nav-bar class="bar-transparent">
            </ion-nav-bar>-->
            <ion-pane ng-controller="CardsCtrl">
            <!--<ion-nav-buttons side="left">
            <button menu-toggle="left" class="button button-icon ion-navicon"></button>
            </ion-nav-buttons>-->
            <td-cards>
            <td-card ng-repeat="card in cards" on-destroy="cardDestroyed($index)" on-swipe-left="cardSwipedLeft($index)" on-swipe-right="cardSwipedRight($index)" on-partial-swipe="cardPartialSwipe(amt)" class="card-{{card.index}}" ng-controller="CardCtrl">
            <div class="image">
            <!--<div class="yes-text" ng-style="leftTextOpacity">LIKE</div>-->
            <img ng-src="{{card.image}}">
            <!--<div class="no-text" ng-style="rightTextOpacity">NOPE</div>-->
            </div>
            </td-card>
            </td-cards>
            </ion-pane>
            </ion-view>

As you can see here the part we're interested in:

                <ion-view hide-nav-bar="true">
            <ion-header-bar align-title="left" class="bar-transparent" >
            <button menu-toggle="left" class="button button-icon ion-ios7-settings">
            </button>
            <div class="title">&nbsp;</div>
            <h1 class="title">proximiti</h1>
            </ion-header-bar>

I tried everything (in the browser i don't see this border!), but nothing to change it! Anyone could help me trying to find the way to delete that border? N.B. : also tried to edit ionic.css and changed only in the browser.

EDIT: And it should be hidden only in this view, so where the class is bar-transparent

No problem,

Just add this to your custom CSS:

.bar-header {
    border: 0px !important;
    border-bottom-color: transparent !important;
    background-image: none;
    border-bottom: none;
}

@BenNov answer doesn't work for me.

this is what i did to remove ion-nav-bar bottom border

.bar {
    background-size: 100% 0px;
}

I'm working with ionic-1.0.0-rc.4