#portfolio {
  display: block;
}

#portfolio li {
  display: block;
  float: left;
  width: 30%;
  max-width: 400px;
  margin-right: 20px;
  margin-bottom: 20px;
}

#portfolio li img { 
border: 0; 
max-width: 100%; 
}

#portfolio li a {
  display: block;
  padding: 8px;
  background: #fff;
  -webkit-border-radius: 2px;
  -moz-border-radius: 2px;
  border-radius: 2px;
  -webkit-box-shadow: 1px 2px 2px rgba(0,0,0,0.25);
  -moz-box-shadow: 1px 2px 2px rgba(0,0,0,0.25);
  box-shadow: 1px 2px 2px rgba(0,0,0,0.25);
}


/** media queries **/
@media only screen and (max-width:760px) and (min-width:300px){
  #portfolio li {
    width: 95%;
	float: left;
  }
}