.flex {
display: flex;
flex-wrap: wrap;
width: 100%;
margin: 0 auto;
}
.side {
flex:1 1 calc(25% - 30px);
margin:5px;
box-sizing:border-box;
min-width:170px;
padding:50px 20px;
font-size:14px;
text-align:center;
background:#b5ced8;
}