responsive design - background-image height to properly scale down in css? -


i have built grid layout content , want use images inside div column background. @ first placed image class of "img-responsive inside div columns , works perfectly. want achieve same effect have image background instead. having trouble getting background-image height scale width of div. img-responsive class have 'width: 100%;' , 'height: auto;' how apply same logic background-image? can't set div column class height: auto; or have max-height of n pixels because displays nothing. below example of code, top 2 divs what want background images like. can explain me how can achieve this? 

      body {          margin: 0 auto;          padding: 30px 30px 5px 30px;          font-family: sans-serif;          color: black;          font-size: 1.2em;        }        section {          width: 80%;          margin: 0px auto;          line-height: 1.5em;          font-size: 0.9em;          padding: 30px;          color: black;          overflow: hidden;        }        .row {          margin: 1% auto;          width: 100%;          overflow: hidden;          padding-bottom: 10px;        }        .row::after {          content: "";          display: table;          clear: both;        }        .col {          line-height: 0;          margin-left: 1%;          margin-right: 1%;          margin-top: 1%;          margin-bottom: 1%;          display: inline-block;          float: left;          overflow: hidden;        }        .col:first-child {          margin-left: 0px;        }        .col:last-child {          margin-right: 0px;        }        .img-responsive {          max-width: 100%;          height: auto;        }        .col.col-6 {          width: 47%;          height: auto;          border: 2px solid black;          margin-left: 1%;          margin-right: 1%;        }        .col.col-6-bg {          width: 47%;          max-height: 1000px;          min-height: 145px;          min-height: 200px;          margin-left: 1%;          margin-right: 1%;          border: 2px solid black;        }        .img-bg {          background-image: url("http://prasinostcharles.com/wp-content/uploads/2014/09/gallery-large_food_cod.jpg");          background-size: cover;          background-repeat: no-repeat;          background-position: center center;        }        @media (max-width: 766px) {          section {            width: 90%;          }          col {            width: 80%;            margin: 10px auto;            padding: 0;          }          .col.col-6 {            width: 98%;            min-height: 141px;            margin-left: 0;            margin-right: 0;          }          .col.col-6-bg {            width: 98%;            min-height: 200px;            margin-left: 1%;            margin-right: 1%;          }        }
<h2>div img</h2>  <div class="row">      <div class="col col-6">      <img class="img-responsive" src="http://prasinostcharles.com/wp-content/uploads/2014/09/gallery-large_food_cod.jpg">    </div>    <div class="col col-6">      <img class="img-responsive" src="http://prasinostcharles.com/wp-content/uploads/2014/09/gallery-large_food_cod.jpg">    </div>    </div>    <h2> div img bacground</h2>  <div class="col col-6-bg img-bg"></div>  <div class="col col-6-bg img-bg"></div>


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