body{
color:black;
padding:0;
margin:0;
background-color:skyblue;
}
header{
color:white;
width:100%;
height:100px;
background:black;
text-align:center;
padding:10px;
}
aside{
float:left;
background:#B9F7FF;
width:150px;
height:600px;
border-right:5px blue;
}

a.hover {
color: black;
    text-decoration: none;
}

a.hover:hover {
    text-decoration: underline;
}

a.hover2 {
color: blue;
    text-decoration: none;
}

a.hover2:hover {
    color: black;
    text-decoration: underline;
}