header, footer{
    background-color: #A52A2A;
    color: #ddd; 
    padding: 10px;
    text-align: center;
}
body {
    background-color: lightyellow;
    }

a:link {
    color: green;
    background-color: transparent;
    text-decoration: none;
    }
a:visited {
    color: green;
    background-color: transparent;
    text-decoration: none;
    }
a:hover {
    color: red;
    background-color: transparent;
    text-decoration: underline;
    }
a:active {
    color: yellow;
    background-color: transparent;
    text-decoration: underline;
    }
    
.img_link {
	width: 180px;
	padding: 10px;
}

.div_pos {
	text-align: center;
	padding : 30px;
}