Hello again taymag,
Haven't we gone over this once already? It's just one solution but, since it works I'm surprised you didn't try it...
//...maybe I'm mis-remembering though.
Try making your CSS look like this -
Code:
.entry-content {text-align: center;}
.product-box {
box-shadow: 0 0 13px #808080;
display: inline-block;
/* float: left; */
height: 300px;
margin: 15px;
padding: 10px;
text-align: center;
width: 370px;
}
There are other solutions if you're not using that due to some conflict I'm not seeing on my end, .js for one. I think this is a very good method of doing what you're asking though.