css - Responsive image issue using Bootstrap -

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i build slider when resize browser want images center part not whole part or not left side part. how ?

css :

.fill { width: 100%; height: 100%; /*background-position: center;*/ /*-webkit-background-size: cover;*/ /*-moz-background-size: cover;*/ /*background-size: cover;*/ background-position: center center; /*-o-background-size: cover;*/ background-color: transparent ; }


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