#img1 
 { float: right;
    margin: 10px 0 10px 15px;
    border: 4px solid #333;
    border-radius: 12px; }
#img2 
{ float: left;
    margin: 10px 15px 10px 0;
    border: 4px dashed #8b5e3c;
    border-radius: 40px; }
#img3 
{ float: right;
margin: 10px 0 10px 15px;
border: 5px double #000;
border-radius: 6px;}
#imgResponsive {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 25px auto;
    float: none;
    border: 4px solid #333;
    border-radius: 12px;
}
footer {
    background-image: url("images/different_filter.jpg"); 
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center;
    padding: 25px 10px; 
}