*
    {
        box-sizing: border-box;
    }

div
    {
        float: left;
        width: 32%;
        height: auto;
        padding: 5px;        
        margin-left: 1%;
        text-align: center;
        border: solid 3px;
    }
    
video 
    {
        width: 100%;
        height: 100%;
    }
    
img
    {
        width: 100%;
        height: 100%;
        border-radius: 5%;
  		-webkit-transition: -webkit-transform .8s ease-in-out;
        transition: transform .8s ease-in-out;
    }    

@media (max-width: 850px)
    {
        div
            {
                float: none;
                width: 90%;
                height: auto;
                padding: 3px;
                margin: 5% auto 5% auto;
                border: solid 3px;
                color: red;
            }
    }