html - why does bootstrap carousel take margin on its left and right side automatically? -

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i trying make carousel full screen. means need carousel 100% wide literally. leaving place on left , right side. other elements working fine. here image:

my code is: 

 <div class="container-fluid">     <div id="mycarousel" class="carousel slide" data-ride="carousel">         <div class="carousel-inner" role="listbox">             <div class="item active">                 <img src="images/slide-1.jpg" alt="" />             </div>             <div class="item">                 <img src="images/slide-2.jpg" alt="" />             </div>             <div class="item">                 <img src="images/slide-3.jpg" alt="" />             </div>         </div>     </div> <div style="width: 100%; height: 300px; background: #990000;">&nbsp;</div> </div>

how remove these unwanted margins?

this because .container have padding-right: 15px; padding-left: 15px; need create new class overwrite making padding-right: 0; padding-left: 0;

<div class="container-fluid header"> ... </div>

.header {padding-right: 0; padding-left: 0;}


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