body{
    background-image:url(img/2b.3.png);
    background-attachment:fixed;
    background-position:center center;
    background-size:cover;
    background-repeat:no-repeat;
}

div#header{
    margin:auto;
    margin-top:10px;
    width:1300px;
    height:150px;
    border:1px outset black;
    box-shadow:0 2px 4px black;
    background-color:#ffffff36;
}

#header:hover{
    border:1px outset white;
    box-shadow:0 2px 4px white;
    background-color:#8080809c;
}

div#nav{
    margin:auto;
    margin-top:10px;
    width:1300px;
    height:100px;
    border:1px outset black;
    box-shadow:0 2px 4px black;
    background-color:#ffffff36;
}

#nav:hover{
    border:1px outset white;
    box-shadow:0 2px 4px white;
    background-color:#8080809c;
}

div#section{
    margin:auto;
    margin-top:15px;
    width:300px;
    height:500px;
    border:1px outset black;
    box-shadow:0 2px 4px black;
    float:left;
    margin-left:17px;
    background-color:#ffffff36;
}

#section:hover{
    border:1px outset white;
    box-shadow:0 2px 4px white;
    background-color:#8080809c;
}

div#aside{
    margin:auto;
    margin-top:15px;
    width:900px;
    height:500px;
    border:1px outset black;
    box-shadow:0 2px 4px;
    float:right;
    margin-right:17px;
    background-color:#ffffff36;
}

#aside:hover{
    border:1px outset white;
    box-shadow:0 2px 4px white;
    background-color:#8080809c;
}

div#footer{
    margin:auto;
    margin-top:15px;
    width:1300px;
    height:100px;
    border:1px outset black;
    box-shadow:0 2px 4px black;
    float:inline-end;
    margin-inline-end:17px;
    background-color:#ffffff36;
}

#footer:hover{
    border:1px outset white;
    box-shadow:0 2px 4px white;
    background-color:#8080809c;
}

