Browserin minimum boyu ve enini css ile tanımlayabiliriz
<style type="text/css"> @media only screen and (min-width: 960px) {#portfolio-wrapper img {min-height: 147px;}} @media only screen and (min-width: 768px) and (max-width: 959px) {#portfolio-wrapper img {min-height: 115px;}} </style>