<div class="cont">
<div class="card"></div>
<div class="card"></div>
<div class="card"></div>
<div class="card"></div>
<div class="card"></div>
<div class="card"></div>
</div>.cont{
display: flex;
align-items: center;
justify-content: space-between;
flex-flow:row wrap;
width: 1200px;
background-color: #f5f5f5;
}
.cont .card{
width:385px;
height:280px;
background:#fff;
border:1px solid #E5E5E5;
}
